Asp_net Ans
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Asp.Net Question With Answer
1. What is ASP.NET?
ASP.NET is a server side scripting technology that enables scripts (embedded in
web pages) to be executed by an Internet server.
ASP.NET provides increased performance by running compiled code.
2. What is the difference between Classic ASP and ASP.Net?
ASP is Interpreted language based on scripting languages like Jscript or
VBScript.
ASP has Mixed HTML and coding logic.
Limited development and debugging tools available.
Limited OOPS support.
Limited session and application state management.
ASP.Net is supported by compiler and has compiled language support.
Separate code and design logic possible.
Variety of compilers and tools available including the Visual studio.Net.
Completely Object Oriented.
Complete session and application state management.
Full XML Support for easy data exchange.
3. What is Difference between Namespace and Assembly?
Namespace is a logical design-time naming convenience, whereas an assembly
establishes the name scope for types at run time.
4. What is the difference between early binding and late binding?
Calling a non-virtual method, decided at a compile time is known as early binding.
Calling a virtual method (Pure Polymorphism), decided at a runtime is known as
late binding.
5. What is the difference between ASP Session State and ASP.Net Session
State?
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ASP session state relies on cookies, Serialize all requests from a client, does not
survive process shutdown, Can not maintained across machines in a Web farm.
6. What is the difference between ASP Session and ASP.NET Session?
Asp.net session supports cookie less session & it can span across multiple servers.
7. What is reflection?
All .NET compilers produce metadata about the types defined in the modules they
produce. This metadata is packaged along with the module (modules in turn are
packaged together in assemblies), and can be accessed by a mechanism called
reflection.
The System.Reflection namespace contains classes that can be used to interrogate
the types for a module/assembly.
8. What is the difference between Server.Transfer and response.Redirect?
The Server.Transfer () method stops the current page from executing, and runs
the content on the specified page, when the execution is complete the control is
passed back to the calling page.
While the Response.Redirect () method transfers the control on the specified
page and the control is never passed back to calling page after execution.
9. What is a PostBack?
The process in which a Web page sends data back to the same page on the server.
10. What namespace does the Web page belong in the .NET Framework
class hierarchy? System.Web.UI.Page
11. What’s a bubbled event?
When you have a complex control, like DataGrid, writing an event processing
routine for each object (cell, button, row, etc.) is quite tedious. The controls can
bubble up their event handlers, allowing the main DataGrid event handler to take
care of its constituents.
12. What is the differences between Server-side and Client-side code?
Server-side code executes on the server.
Client-side code executes in the client’s browser.
13. What is the difference between static or dynamic assemblies?
Assemblies can be static or dynamic.
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Static assemblies can include .NET Framework types (interfaces and classes), as
well as resources for the assembly (bitmaps, JPEG files, resource files, and so on).
Static assemblies are stored on disk in portable executable (PE) files.
Dynamic assemblies, which are run directly from memory and are not saved to
disk before execution. You can save dynamic assemblies to disk after they have
executed.
14. What are the difference between Structure and Class?
Structures are value type and Classes are reference type
Structures can not have constructor or destructors.
Classes can have both constructor and destructors.
Structures do not support Inheritance, while Classes support Inheritance.
15. What is the differences between dataset.clone and dataset.copy?
Dataset.clone copies just the structure of dataset (including all the datatables,
schemas, relations and constraints.); however it doesn’t copy the data.
Dataset.copy, copies both the dataset structure and the data.
16. What is the difference between Custom Control and User Control?
Custom Controls are compiled code (Dlls), easier to use, difficult to create, and
can be placed in toolbox. Drag and Drop controls. Attributes can be set visually at
design time. Can be used by Multiple Applications (If Shared Dlls), Even if Private
can copy to bin directory of web application add reference and use. Normally
designed to provide common functionality independent of consuming Application.
User Controls are similar to those of ASP include files, easy to create, can not be
placed in the toolbox and dragged - dropped from it. A User Control is shared
among the single application files.
17. What is the difference between ASP Session State and ASP.Net Session
State?
ASP session state relies on cookies, Serialize all requests from a client, does not
survive process shutdown, Can not maintained across machines in a Web farm.
18. What is ViewState?
ViewState is a .Net mechanism to store the posted data among post backs.
ViewState allows the state of objects to be stored in a hidden field on the page,
saved on client side and transported back to server whenever required.
19. What is Authentication and Authorization?
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Authentication is the process of identifying users. Authentication is
identifying/validating the user against the credentials (username and password)
and Authorization performs after authentication.
Authorization is the process of granting access to those users based on identity.
Authorization allowing access of specific resource to user.
20. What are the types of Authentication?
There are 3 types of Authentication. Windows, Forms and Passport
Authentication.
Windows authentication uses the security features integrated into the
Windows NT and Windows XP operating systems to authenticate and
authorize Web application users.
Forms authentication allows you to create your own list/database of users
and validate the identity of those users when they visit your Web site.
Passport authentication uses the Microsoft centralized authentication
provider to identify users. Passport provides a way to for users to use a
single identity across multiple Web applications. To use Passport
authentication in your Web application, you must install the Passport SDK.
21. What are the different types of Validation Controls?
There are six types of validation controls available :
RequiredFieldValidator
RangeValidator
RegularExpressionValidator
CompareValidator
CustomValidator
ValidationSummary
22. What is the Web User Control?
Combines existing Server and/or HTML controls by using VS.Net to create functional
units that encapsulate some aspects of UI. Resides in Content Files, which must be
included in project in which the controls are used.
23. What namespaces are necessary to create a localized application?
System.Globalization
System.Resources
24. How to Manage State in ASP.Net?
There are several ways to manage a state.
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ViewState
QueryString
Cookies
Session
Application
25. What are the different types of Caching?
There are three types of Caching :
Output Caching: stores the responses from an asp.net page.
Fragment Caching: Only caches/stores the portion of page (User Control)
Data Caching: is Programmatic way to Cache objects for performance.
26. . What is Side-by-Side Execution?
The CLR allows any versions of the same-shared DLL (shared assembly) to
execute at the same time, on the same system, and even in the same process. This
concept is known as side-by-side execution.
27. How to view an assembly?
We can use the tool "ildasm.exe" known as "Assembly Disassembler" to view the
assembly.
28. Which are the namespaces that are imported automatically by Visual
Studio in ASP.Net?
There are 7 namespaces which are imported automatically.
System
System.Collections
System.IO
System.web
System.web.UI
System.web.UI.HTMLControls
System.web.UI.WebControls.
29. What are the layouts of ASP.NET Pages?
GridLayout
FlowLayout
.
GridLayout positions the form object on absolute x and y co-ordinates of the
screen.
FlowLayout positions the form objects relative to each other.
30. What is Delegates?
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Delegates are a type-safe, object-oriented implementation of function pointers and
are used in many situations where a component needs to call back to the
component that is using it. Delegates are generally used as basis of events, which
allow any delegate to easily be registered for as event.
31. What is a Namespace? What is the use of a namespace?
Namespaces are logical grouping of classes and other types in hierarchical
structure.
Namespaces are useful to avoid collision or ambiguity among the classes and type
names.
Another use of the namespace is to arrange a group of classes for a specific
purpose.
32. What’s the difference between Codebehind="MyCode.aspx.cs" and
Src="MyCode.aspx.cs"?
Visual Studio uses the Codebehind attribute to distinguish the page source or
programming logic from the design. Also the src attribute will make the page
compile on every request. That is the page will not be compiled in advance and
stored in the bin as a dll instead it will be compiled at run time.
33. What is datagrid?
The DataGrid Web server control is a powerful tool for displaying information from
a data source. It is easy to use; you can display editable data in a professionallooking grid by setting only a few properties. At the same time, the grid has a
sophisticated object model that provides you with great flexibility in how you
display the data.
34. How do you hide the columns?
One way to have columns appear dynamically is to create them at design time,
and then to hide or show them as needed. You can do this by setting a column’s
“Visible” property.
35. What are different types of directives in .NET?
@Page
@Control
@Import
@Implements
@Register
@Assembly
@OutputCache
@Reference
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36. What data type does the RangeValidator control support?
Integer
String.
Date.
37. What is cookies?
Cookies are small pieces of text, stored on the client’s computer to be used only
by the website setting the cookies. This allows webapplications to save information
for the user, and then re-use it on each page if needed
38. How many classes can a single .NET DLL contain?
It can contain many classes.
39. What methods are fired during the page load?
Init() - when the page is instantiated.
Load() - when the page is loaded into server memory.
PreRender() - the brief moment before the page is displayed to the user as
HTML.
Unload() - when page finishes loading.
40. What is the difference between Value Types and Reference Types?
Value Types uses Stack to store the data.
where as Reference type uses the Heap to store the data.
41. What is the difference between Server-side scripting and Client-side
scripting?
Server side scripting means that all the script will be executed by the server and
interpreted as needed. ASP doesn't have some of the functionality like sockets,
uploading, etc.
Client side scripting means that the script will be executed immediately in the
browser such as form field validation, clock, email validation, etc. Client side
scripting is usually done in VBScript or JavaScript.
42. How do you create a permanent cookie?
Permanent cookies are available until a specified expiration date, and are stored
on the hard disk.So Set the 'Expires' property any value greater than
DataTime.MinValue with respect to the current datetime. If u want the cookie which
never expires set its Expires property equal to DateTime.maxValue.
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43. Which method do you use to redirect the user to another page without
performing a round trip to the client?
Server.Transfer
Server.Execute.
44. Which method do you use to redirect the user to another page without
performing a round trip to the client?
Server.transfer
45. What tag do you use to add a hyperlink column to the DataGrid?
< asp:HyperLinkColumn > < / asp:HyperLinkColumn >
46. What is web.config file?
Web.config file is the configuration file for the Asp.net web application. There is
one web.config file for one asp.net application which configures the particular
application. Web.config file is written in XML with specific tags having specific
meanings.It includes databa which includes connections,Session States,Error
Handling,Security etc.
47. What is the difference between in-proc and out-of-proc?
An Inproc is one which runs in the same process area as that of the client giving
tha advantage of speed but the disadvantage of stability becoz if it crashes it takes
the client application also with it.
Outproc is one which works outside the clients memory thus giving stability to the
client, but we have to compromise a bit on speed.
48. What is a PostBack?
The process in which a Web page sends data back to the same page on the
server.
49. How many languages .NET is supporting now?
When .NET was introduced it came with several languages. VB.NET, C#, COBOL
and Perl, etc. The site DotNetLanguages.Net says 44 languages are supported.
50. What is smart navigation?
The cursor position is maintained when the page gets refreshed due to the server
side validation and the page gets refreshed.
51. How do you validate the controls in an ASP .NET page?
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Using special validation controls that are meant for this. We have Range Validator,
Email Validator
52. How do you turn off cookies for one page in your site?
Use Cookie.Discard property, Gets or sets the discard flag set by the server. When
true, this property instructs the client application not to save the Cookie on the
user's hard disk when a session ends.
53. Which two properties are on every validation control?
We have two common properties for every validation controls:
Control to Validate
Error Message
54. Which control would you use if you needed to make sure the values in
two different controls matched?
CompareValidator is used to ensure that two fields are identical.
55. What is the difference between HTTP-Post and HTTP-Get?
The GET method creates a query string and appends it to the script's URL on the
server that handles the request.
The POST method creates a name/value pairs that are passed in the body of the
HTTP request message.
56. What is strong-typing versus weak-typing?
Strong typing implies that the types of variables involved in operations are
associated to the variable, checked at compile-time, and require explicit conversion
Weak typing implies that they are associated to the value, checked at run-time,
and are implicitly converted as required.
57. What is boxing and unboxing?
Implicit conversion of value type to reference type of a variable is known as
BOXING, for example integer to object type conversion.
Conversion of reference type variable back to value type is called as UnBoxing.
58. What is garbage collection?
Garbage collection is a system whereby a run-time component takes responsibility
for managing the lifetime of objects and the heap memory that they occupy.
59. What is serialization?
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Serialization is the process of converting an object into a stream of bytes.
Deserialization is the opposite process of creating an object from a stream of bytes.
Serialization / Deserialization is mostly used to transport objects.
60. What is the differnce between Managed code and unmanaged code?
Managed Code: Code that runs under a "contract of cooperation" with the
common language runtime. Managed code must supply the metadata necessary for
the runtimeto provide services such as memory management, cross-language
integration, code access security, and automatic lifetime control of objects. All code
based on Microsoft intermediate language (MSIL) executes as managed code.
Un-Managed Code:Code that is created without regard for the conventions and
requirements of the common language runtime. Unmanaged code executes in the
common language runtime environment with minimal services (for example, no
garbage collection, limited debugging, and so on).
61. What is difference between constants, readonly and, static?
Constants: The value can’t be changed.
Read-only: The value will be initialized only once from the constructor of the
class.
Static: Value can be initialized once.
62. What is namespace used for loading assemblies at run time and name
the methods?
System.Reflection
63. How big is the datatype int in .NET?
32 bits
64. What is difference between abstract classes and interfaces?
Abstract classes can have concrete methods while interfaces have no methods
implemented.
Interfaces do not come in inheriting chain, while abstract classes come in
inheritance.
65. In which event are the controls fully loaded?
Page_load event guarantees that all controls are fully loaded. Controls are also
accessed.
In Page_Init events but you will see that viewstate is not fully loaded during this
event.
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66. What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the
page.
67. Define RequiredFieldValidator?
It checks whether the control have any value. It's used when you want the control
should not be empty.
68. What are the different types of Session state management options
available with ASP.NET?
ASP.NET provides In-Process and Out-of-Process state management. In-Process
stores the session in memory on the web server. Out-of-Process Session state
management stores data in an external data source. The external data source may
be either a SQL Server or a State Server service. Out-of-Process state management
requires that all objects stored in session are serializable.
69. What are the difference between const and readonly?
A const can not be static, while readonly can be static.
A const need to be declared and initialized at declaration only, while a
readonly can be initialized at declaration or by the code in the constructor.
A const’s value is evaluated at design time, while a readonly’s value is
evaluated at runtime.
70. How do you turn off cookies in one page of your asp.net application?
We may not use them at the max, However to allow the cookies or not, is client
side functionality.
71. What’s the difference between Response.Write () and
Response.Output.Write()?
Response.Outout.Write allows us to write the formatted out put.
72. What is the difference between inline and code behind?
Inline code written along with the html and design blocks in an .aspx page.
Code-behind is code written in a separate file (.cs or .vb) and referenced by the
.aspx page.
73. What is the difference between early binding and late binding?
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Calling a non-virtual method, decided at a compile time is known as early binding.
Calling a virtual method (Pure Polymorphism), decided at a runtime is known as
late binding.
74. What is the difference between ASP Session and ASP.NET Session?
Asp.net session supports cookie less session & it can span across multiple servers.
75. What is Common Language Runtime?
CLR also known as Common Language Run time provides a environment in
which program are executed, it activate object, perform security check on them, lay
them out in the memory, execute them and garbage collect them.
76. What is Intermediate Language?
MSIL are also known as Microsoft Intermediate Language is the CPUindependent instruction set into which .Net framework programs are compiled. It
contains instructions for loading, storing initializing, and calling methods on objects.
77. What is CTS?
The Common type system is a rich type system, built into the common language
runtime, which supports the types and operations found in most programming
languages.
78. What is Common Langauge Specification?
CLS also known as Common Language Specification defines the rules which all
language must support, in order to be a part of .Net framework. The Common
Language Specification is a set of constructs and constraints that serves as a guide
for library writers and compiler writers.
79. Which class deals wit the user’s locale information?
System.Web.UI.Page.Culture
80. What is the lifespan for items stored in ViewState?
Items stored in a ViewState exist for the life of the current page, including the post
backs on the same page.
81. Can we disable ViewState, If, yes how?
ViewState can be disabled by using "EnableViewState" property set to false.
82. Can you give an example of what might be best suited to place in the
Application_Start and Session_Start subroutines?
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All the global declarations or the variables used commonly across the application
can be deployed under Application_Start. All the user specific tasks or declarations
can be dealt in the Session_Start subroutine.
83. What is an assembly?
Assemblies are the building blocks of the .NET framework. They are the logical
grouping of the functionality in a physical file.
84. What are different types of Assemblies?
Single file and multi file assembly.
Assemblies can be static or dynamic.
Private assemblies and shared assemblies.
85. Which method do you invoke on the DataAdapter control to load your
generated dataset with data?
DataAdapter’s fill () method is used to fill load the data in dataset.
86. Which template is to be provided in the Repeater control in order to
display a data?
ItemTemplate
AlternatingItemTemplate.
87. What are the advantages of an assembly?
Increased performance.
Better code management and encapsulation.
It also introduces the n-tier concepts and business logic.
88. What is an ArrayList?
The ArrayList object is a collection of items containing a single data type values.
89. What is a Literal Control?
The Literal control is used to display text on a page. The text is programmable.
This control does not let you apply styles to its content.
90. Which namespaces are used for data access?
System.Data
System.Data.OleDB
System.Data.SQLClient
91. What is Remoting?
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Remoting is a means by which one operating system process, or program, can
communicate with another process. The two processes can exist on the same
computer or on two computers connected by a LAN or the Internet.
92. What’s the use of “GLOBAL.ASAX” file?
It allows to executing ASP.NET application level events and setting applicationlevel variables.
93.What is a SESSION and APPLICATION object?
Session object store information between HTTP requests for a particular user.
Session variables are used to store user specific information where as in application
variables we can’t store user specific information.
while application object are global across users.
94. What is the difference between a Thread and a Process?
A thread is a path of execution that run on CPU, a proccess is a collection of
threads that share the same virtual memory.
A process have at least one thread of execution, and a thread always run in a
process context.
95. What's the difference between the Debug class and Trace class?
Documentation looks the same.
Use Debug class for debug builds.
use Trace class for both debug and release builds.
96. What’s the top .NET class that everything is derived from?
System.Object
97. How is method overriding different from overloading?
When Overriding, you change the method behavior for a derived class.
Overloading simply involves having a method with the same name within the
class.
98. What is the difference between System.String and
System.StringBuilder classes?
System.String is immutable.
System.StringBuilder was designed with the purpose of having a mutable
string where a variety of operations can be performed.
99. What is the differences between Server-side and Clientside code?
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Server side code is executed at the server side on IIS in ASP.NET framework.
while client side code is executed on the browser.
100. What’s an interface?
It’s an abstract class with public abstract methods all of which must be
implemented in the inherited classes.
101. What is a formatter?
A formatter is an object that is responsible for encoding and serializing data into
messages on one end, and deserializing and decoding messages into data on the
other end.
102. What is Marshalling?
Marshaling is a process of making an object in one process (the server)
available to another process (the client). There are two ways to achieve the
marshalling.
Marshal by value
Marshal by reference.
103. What is a Static class?
Static class is a class which can be used or accessed without creating an instance
of the class.
104. What is a DataSet?
A DataSet is an in memory representation of data loaded from any data source.
105. What are the differences between value type and reference type?
Value type contain variable and reference type are not containing value directly in
its memory.
Memory is allocated in managed heap in reference type and in value type memory
allocated in stack. Reference type ex-class value type-struct, enumeration
106. What is a DataTable?
A DataTable is a class in .NET Framework and in simple words a DataTable object
represents a table from a database.
107. What is a life span of a static variable?
A static variable’s life span is till the class is in memory
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108. What is the difference between an abstract method & virtual method?
An Abstract method does not provide an implementation and forces overriding to
the deriving class (unless the deriving class also an abstract class),
Virtual method has an implementation and leaves an option to override it in the
deriving class. Thus Virtual method has an implementation & provides the derived
class with the option of overriding it. Abstract method does not provide an
implementation & forces the derived class to override the method.
109. How many namespaces are in .NET version 1.1?
124
110. What is sealed class
Sealed classes are those classes which can not be inherited and thus any
sealed class member can not be derived in any other class.
A sealed class cannot also be an abstract class.
111. What are the components of web form in ASP.NET?
Server controls
HTML controls
Data controls
System components.
112. How do you turn off cookies for one page in your site?
Use the Cookie. Discard Property which Gets or sets the discard flag set by the
server. When true, this property instructs the client application not to save the
Cookie on the users hard disk when a session ends.
113. What is AutoPostback?
AutoPostBack automatically posts the page back to the server when state of the
control is changed.
114. What is Globalization?
Globalization is the process of creating multilingual application by defining culture
specific features like currency, date and time format, calendar and other issues.
115. What is the main difference between Asp.net and Vb.net?
Asp.net is a web technology used for designing webforms and Vb.net is a
programming language
ASP.NET is a powerful technology for writing dynamic web pages.
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ASP.NET is a way of creating dynamic web pages while making use of the
innovations present in .NET.
VB.NET is a language.But ASP.NET is the Environment where we can create
websites or webpages.
116. Is string a value type or a reference type?
Srting is a Reference type.It can create a new instance at every time.
117. What base class do all Web Forms inherit from?
System.web.UI.Page class
118. What does assert () do?
In debug compilation, assert takes in a Boolean condition as a parameter, and
shows the error dialog if the condition is false. The program proceeds without any
interruption if the condition is true.
119. What is cookie less session? How it works?
By default, ASP.NET will store the session state in the same process that processes
the request, just as ASP does. If cookies are not available, a session can be tracked
by adding a session identifier to the URL.
120. What is the difference between Compiler and Interpreter?
Compiler:
A compiler is a program that translates program (called source code) written in
some high level language into object code.A compiler translates high-level
instructions directly into machine language and this process is called compiling.
Interpreter:
An interpreter translates high-level instructions into an intermediate form, which it
then executes. Interpreter analyzes and executes each line of source code in
succession, without looking at the entire program; the advantage of interpreters is
that they can execute a program immediately.
121. What is the difference between an ADO.NET Dataset and an ADO
Recordset?
A DataSet can represent an entire relational database in memory, complete
with tables, relations, and views.
A DataSet is designed to work without any continuing connection to the
original data source.
DataSets have no current record pointer You can use For Each loops to move
through the data.
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Though the DataSet is universal, other objects in ADO.NET come in different
versions for different data sources.
Data in a DataSet is bulk-loaded, rather than being loaded on demand.
You can store many edits in a DataSet, and write them to the original data
source in a single operation.
122. What are the validation controls?
A set of server controls included with ASP.NET that test user input in HTML and
Web server controls for programmer-defined requirements. Validation controls
perform input checking in server code. If the user is working with a browser that
supports DHTML, the validation controls can also perform validation using client
script.
123. What is the difference between “Web.config” and “Machine.Config”?
“Web.config” files apply settings to each web application.
While “Machine.config” file apply settings to all ASP.NET applications.
124. What is event bubbling?
Server controls like Data grid, Data List, and Repeater can have other child
controls inside them. Example Data Grid can have combo box inside data grid.
These child control do not raise there events by themselves, rather they pass the
event to the container parent (which can be a data grid, data list, repeater), which
passed to the page as “ItemCommand” event. As the child control send events to
parent it is termed as event bubbling.
125. What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the
page.
126. Where is View State information stored?
In HTML Hidden Fields.
127. What is role based security?
By default, ASP.NET will store the session state in the same process that processes
the request, just as ASP does. If cookies are not available, a session can be tracked
by adding a session identifier to the URL.
128. What is the difference between Asp and Asp.net?
ASP (Active Server Pages) and ASP.NET are both server side technologies for
building web sites and web applications, ASP.NET is Managed compiled code - asp
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is interpreted. and ASP.net is fully Object oriented.
ASP.NET has been entirely re-architected to provide a highly productive
programming experience based on the .NET Framework, and a robust infrastructure
for building reliable and scalable web applications.
129. What are the various security methods which IIS Provides apart from
.NET?
The various security methods which IIS provides are :
Authentication Modes.
IP Address and Domain Name Restriction.
DNS Lookups DNS Lookups.
Though the DataSet is universal, other objects in ADO.NET come in different
versions for different data sources.
The Network ID and Subnet Mask.
SSL.
130. What are Master Pages in ASP.NET?
ASP.NET master pages allow you to create a consistent layout for the pages in your
application. A single master page defines the look and feel and standard behavior
that you want for all of the pages in your application. You can then create individual
content pages that contain the content you want to display. When users request the
content pages, they merge with the master page to produce output that combines
the layout of the master page with the content from the content page.
131. What are the advantages of ASP.Net?
ASP.NET makes development simpler and easier to maintain with an eventdriven, server-side programming model.
ASP.NET offers built-in security features through windows authentication or
other authentication methods.
Content and program logic are separated which reduces the inconveniences
of program maintenance.
Built-in caching features.
132. What is event bubbling?
Server controls like Data grid, Data List, and Repeater can have other child
controls inside them. Example Data Grid can have combo box inside data grid.
These child control do not raise there events by themselves, rather they pass the
event to the container parent (which can be a data grid, data list, repeater), which
passed to the page as “ItemCommand” event. As the child control send events to
parent it is termed as event bubbling.
133. What is WSDL?
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WSDL stands for Web Services Description Language is an XML-based language for
describing Web services and how to access them.
WSDL is used to describe Web services.
134. What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the
page.
135. What is the difference between javascript and vbscript?
Javascript :
JavaScript is a client-side scripting language.
JavaScript is used to create interactive web applications supported by the Netscape
browser.
JavaScript is simple to use, lightweight, and dynamic. Developers can easily embed
code functionality for interactive applications inside a web page.
Javascript is case sensitive and it will be run on client side.
VBScript:
VBScript is a server-side scripting language.
VBScript is not case sensitive and it will be run on server side.
136. What is a web server?
A web server delivers requested web pages to users who enter the URL in a web
browser. Every computer on the Internet that contains a web site must have a web
server program.
137. What are Cascading style sheets?
Cascading style sheets (CSS) collect and organize all of the formatting
information applied to HTML elements on a Web form. Because they keep this
information in a single location, style sheets make it easy to adjust the appearance
of Web applications.
138. What is the base class of .net?
System.object
139. What is the base class of Asp.net?
system.Web.UI
140. what is use of web.config?
Web.config is used connect database from front end to back end.
Web.config is used to maintain the Appsettimgs instead of static variables.
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141. What is difference between abstract classes and interfaces?
Abstract classes can have concrete methods while interfaces have no methods
implemented.
Interfaces do not come in inheriting chain, while abstract classes come in
inheritance.
142. What is GAC or Global Assembly Cache?
Global Assembly Cache (GAC) is a common place to share the .NET assemblies
across many applications. GAC caches all strong named assembly references within
it. All System assemblies that come with the .NET framework reside in the GAC.
143. What is a HashTable?
The Hashtable object contains items in key/value pairs. The keys are used as
indexes, and very quick searches can be made for values by searching through
their keys.
144. What is CAS or Code Access Security?
Code Access Security - CAS is the part of the .NET security model that
determines whether or not a piece of code is allowed to run, and what resources it
can use when it is running.
145. What is the Composite Custom Control?
Combination of existing HTML and Server Controls.
146. What is RangeValidator?
RangeValidator - checks whether a value falls within a given range of number, date
or string.
147. What base class do all Web Forms inherit from?
System.web.UI.Page class
148. What is the difference between System.String and
System.Text.StringBuilder classes?
System.String is immutable.
System.StringBuilder was designed with the purpose of having a mutable string
where a variety of operations can be performed.
149. How to Create a Cookie?
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Cookie are one of several ways to store data about web site visitors during the time
when web server and browser are not connected. Common use of cookies is to
remember users between visits. Practically, cookie is a small text file sent by web
server and saved by web browser on client machine.
The“Response.Cookies” command is used to create cookies.
150. How do you identify a Master Page?
The master page is identified by a special @ Master directive that replaces the @
Page directive that is used for ordinary .aspx pages.
151. Explain what a diffgram is and a good use for one?
The DiffGram is one of the two XML formats that you can use to render DataSet
object contents to XML. For reading database data to an XML file to be sent to a
Web Service.
152. What is ValidationSummary?
ValidationSummary - It show a summary of errors raised by each control on the
page on a specific spot or in a message box.
153. How do you indentify that the page is post back?
By checking the IsPostBack property. If IsPostBack is True, the page has been
posted back.
154. what are the types of ASP Objects?
There are various types of Asp objects
Session Object
Application Object
Server Object
Request Object
Request Object
Response Object
Object Context
Error Object
155. What are remotable objects in .NET Remoting?
Remotable objects are the objects that can be marshaled across the application
domains. You can marshal by value, where a deep copy of the object is created and
then passed to the receiver. You can also marshal by reference, where just a
reference to an existing object is passed.
156. What is the difference between ASP Session and ASP.NET Session?
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Asp.net session supports cookie less session & it can span across multiple servers.
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1. What is ASP.NET?
ASP.NET is a server side scripting technology that enables scripts (embedded in
web pages) to be executed by an Internet server.
ASP.NET provides increased performance by running compiled code.
2. What is the difference between Classic ASP and ASP.Net?
ASP is Interpreted language based on scripting languages like Jscript or
VBScript.
ASP has Mixed HTML and coding logic.
Limited development and debugging tools available.
Limited OOPS support.
Limited session and application state management.
ASP.Net is supported by compiler and has compiled language support.
Separate code and design logic possible.
Variety of compilers and tools available including the Visual studio.Net.
Completely Object Oriented.
Complete session and application state management.
Full XML Support for easy data exchange.
3. What is Difference between Namespace and Assembly?
Namespace is a logical design-time naming convenience, whereas an assembly
establishes the name scope for types at run time.
4. What is the difference between early binding and late binding?
Calling a non-virtual method, decided at a compile time is known as early binding.
Calling a virtual method (Pure Polymorphism), decided at a runtime is known as
late binding.
5. What is the difference between ASP Session State and ASP.Net Session
State?
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ASP session state relies on cookies, Serialize all requests from a client, does not
survive process shutdown, Can not maintained across machines in a Web farm.
6. What is the difference between ASP Session and ASP.NET Session?
Asp.net session supports cookie less session & it can span across multiple servers.
7. What is reflection?
All .NET compilers produce metadata about the types defined in the modules they
produce. This metadata is packaged along with the module (modules in turn are
packaged together in assemblies), and can be accessed by a mechanism called
reflection.
The System.Reflection namespace contains classes that can be used to interrogate
the types for a module/assembly.
8. What is the difference between Server.Transfer and response.Redirect?
The Server.Transfer () method stops the current page from executing, and runs
the content on the specified page, when the execution is complete the control is
passed back to the calling page.
While the Response.Redirect () method transfers the control on the specified
page and the control is never passed back to calling page after execution.
9. What is a PostBack?
The process in which a Web page sends data back to the same page on the server.
10. What namespace does the Web page belong in the .NET Framework
class hierarchy? System.Web.UI.Page
11. What’s a bubbled event?
When you have a complex control, like DataGrid, writing an event processing
routine for each object (cell, button, row, etc.) is quite tedious. The controls can
bubble up their event handlers, allowing the main DataGrid event handler to take
care of its constituents.
12. What is the differences between Server-side and Client-side code?
Server-side code executes on the server.
Client-side code executes in the client’s browser.
13. What is the difference between static or dynamic assemblies?
Assemblies can be static or dynamic.
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Static assemblies can include .NET Framework types (interfaces and classes), as
well as resources for the assembly (bitmaps, JPEG files, resource files, and so on).
Static assemblies are stored on disk in portable executable (PE) files.
Dynamic assemblies, which are run directly from memory and are not saved to
disk before execution. You can save dynamic assemblies to disk after they have
executed.
14. What are the difference between Structure and Class?
Structures are value type and Classes are reference type
Structures can not have constructor or destructors.
Classes can have both constructor and destructors.
Structures do not support Inheritance, while Classes support Inheritance.
15. What is the differences between dataset.clone and dataset.copy?
Dataset.clone copies just the structure of dataset (including all the datatables,
schemas, relations and constraints.); however it doesn’t copy the data.
Dataset.copy, copies both the dataset structure and the data.
16. What is the difference between Custom Control and User Control?
Custom Controls are compiled code (Dlls), easier to use, difficult to create, and
can be placed in toolbox. Drag and Drop controls. Attributes can be set visually at
design time. Can be used by Multiple Applications (If Shared Dlls), Even if Private
can copy to bin directory of web application add reference and use. Normally
designed to provide common functionality independent of consuming Application.
User Controls are similar to those of ASP include files, easy to create, can not be
placed in the toolbox and dragged - dropped from it. A User Control is shared
among the single application files.
17. What is the difference between ASP Session State and ASP.Net Session
State?
ASP session state relies on cookies, Serialize all requests from a client, does not
survive process shutdown, Can not maintained across machines in a Web farm.
18. What is ViewState?
ViewState is a .Net mechanism to store the posted data among post backs.
ViewState allows the state of objects to be stored in a hidden field on the page,
saved on client side and transported back to server whenever required.
19. What is Authentication and Authorization?
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Authentication is the process of identifying users. Authentication is
identifying/validating the user against the credentials (username and password)
and Authorization performs after authentication.
Authorization is the process of granting access to those users based on identity.
Authorization allowing access of specific resource to user.
20. What are the types of Authentication?
There are 3 types of Authentication. Windows, Forms and Passport
Authentication.
Windows authentication uses the security features integrated into the
Windows NT and Windows XP operating systems to authenticate and
authorize Web application users.
Forms authentication allows you to create your own list/database of users
and validate the identity of those users when they visit your Web site.
Passport authentication uses the Microsoft centralized authentication
provider to identify users. Passport provides a way to for users to use a
single identity across multiple Web applications. To use Passport
authentication in your Web application, you must install the Passport SDK.
21. What are the different types of Validation Controls?
There are six types of validation controls available :
RequiredFieldValidator
RangeValidator
RegularExpressionValidator
CompareValidator
CustomValidator
ValidationSummary
22. What is the Web User Control?
Combines existing Server and/or HTML controls by using VS.Net to create functional
units that encapsulate some aspects of UI. Resides in Content Files, which must be
included in project in which the controls are used.
23. What namespaces are necessary to create a localized application?
System.Globalization
System.Resources
24. How to Manage State in ASP.Net?
There are several ways to manage a state.
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ViewState
QueryString
Cookies
Session
Application
25. What are the different types of Caching?
There are three types of Caching :
Output Caching: stores the responses from an asp.net page.
Fragment Caching: Only caches/stores the portion of page (User Control)
Data Caching: is Programmatic way to Cache objects for performance.
26. . What is Side-by-Side Execution?
The CLR allows any versions of the same-shared DLL (shared assembly) to
execute at the same time, on the same system, and even in the same process. This
concept is known as side-by-side execution.
27. How to view an assembly?
We can use the tool "ildasm.exe" known as "Assembly Disassembler" to view the
assembly.
28. Which are the namespaces that are imported automatically by Visual
Studio in ASP.Net?
There are 7 namespaces which are imported automatically.
System
System.Collections
System.IO
System.web
System.web.UI
System.web.UI.HTMLControls
System.web.UI.WebControls.
29. What are the layouts of ASP.NET Pages?
GridLayout
FlowLayout
.
GridLayout positions the form object on absolute x and y co-ordinates of the
screen.
FlowLayout positions the form objects relative to each other.
30. What is Delegates?
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Delegates are a type-safe, object-oriented implementation of function pointers and
are used in many situations where a component needs to call back to the
component that is using it. Delegates are generally used as basis of events, which
allow any delegate to easily be registered for as event.
31. What is a Namespace? What is the use of a namespace?
Namespaces are logical grouping of classes and other types in hierarchical
structure.
Namespaces are useful to avoid collision or ambiguity among the classes and type
names.
Another use of the namespace is to arrange a group of classes for a specific
purpose.
32. What’s the difference between Codebehind="MyCode.aspx.cs" and
Src="MyCode.aspx.cs"?
Visual Studio uses the Codebehind attribute to distinguish the page source or
programming logic from the design. Also the src attribute will make the page
compile on every request. That is the page will not be compiled in advance and
stored in the bin as a dll instead it will be compiled at run time.
33. What is datagrid?
The DataGrid Web server control is a powerful tool for displaying information from
a data source. It is easy to use; you can display editable data in a professionallooking grid by setting only a few properties. At the same time, the grid has a
sophisticated object model that provides you with great flexibility in how you
display the data.
34. How do you hide the columns?
One way to have columns appear dynamically is to create them at design time,
and then to hide or show them as needed. You can do this by setting a column’s
“Visible” property.
35. What are different types of directives in .NET?
@Page
@Control
@Import
@Implements
@Register
@Assembly
@OutputCache
@Reference
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36. What data type does the RangeValidator control support?
Integer
String.
Date.
37. What is cookies?
Cookies are small pieces of text, stored on the client’s computer to be used only
by the website setting the cookies. This allows webapplications to save information
for the user, and then re-use it on each page if needed
38. How many classes can a single .NET DLL contain?
It can contain many classes.
39. What methods are fired during the page load?
Init() - when the page is instantiated.
Load() - when the page is loaded into server memory.
PreRender() - the brief moment before the page is displayed to the user as
HTML.
Unload() - when page finishes loading.
40. What is the difference between Value Types and Reference Types?
Value Types uses Stack to store the data.
where as Reference type uses the Heap to store the data.
41. What is the difference between Server-side scripting and Client-side
scripting?
Server side scripting means that all the script will be executed by the server and
interpreted as needed. ASP doesn't have some of the functionality like sockets,
uploading, etc.
Client side scripting means that the script will be executed immediately in the
browser such as form field validation, clock, email validation, etc. Client side
scripting is usually done in VBScript or JavaScript.
42. How do you create a permanent cookie?
Permanent cookies are available until a specified expiration date, and are stored
on the hard disk.So Set the 'Expires' property any value greater than
DataTime.MinValue with respect to the current datetime. If u want the cookie which
never expires set its Expires property equal to DateTime.maxValue.
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43. Which method do you use to redirect the user to another page without
performing a round trip to the client?
Server.Transfer
Server.Execute.
44. Which method do you use to redirect the user to another page without
performing a round trip to the client?
Server.transfer
45. What tag do you use to add a hyperlink column to the DataGrid?
< asp:HyperLinkColumn > < / asp:HyperLinkColumn >
46. What is web.config file?
Web.config file is the configuration file for the Asp.net web application. There is
one web.config file for one asp.net application which configures the particular
application. Web.config file is written in XML with specific tags having specific
meanings.It includes databa which includes connections,Session States,Error
Handling,Security etc.
47. What is the difference between in-proc and out-of-proc?
An Inproc is one which runs in the same process area as that of the client giving
tha advantage of speed but the disadvantage of stability becoz if it crashes it takes
the client application also with it.
Outproc is one which works outside the clients memory thus giving stability to the
client, but we have to compromise a bit on speed.
48. What is a PostBack?
The process in which a Web page sends data back to the same page on the
server.
49. How many languages .NET is supporting now?
When .NET was introduced it came with several languages. VB.NET, C#, COBOL
and Perl, etc. The site DotNetLanguages.Net says 44 languages are supported.
50. What is smart navigation?
The cursor position is maintained when the page gets refreshed due to the server
side validation and the page gets refreshed.
51. How do you validate the controls in an ASP .NET page?
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Using special validation controls that are meant for this. We have Range Validator,
Email Validator
52. How do you turn off cookies for one page in your site?
Use Cookie.Discard property, Gets or sets the discard flag set by the server. When
true, this property instructs the client application not to save the Cookie on the
user's hard disk when a session ends.
53. Which two properties are on every validation control?
We have two common properties for every validation controls:
Control to Validate
Error Message
54. Which control would you use if you needed to make sure the values in
two different controls matched?
CompareValidator is used to ensure that two fields are identical.
55. What is the difference between HTTP-Post and HTTP-Get?
The GET method creates a query string and appends it to the script's URL on the
server that handles the request.
The POST method creates a name/value pairs that are passed in the body of the
HTTP request message.
56. What is strong-typing versus weak-typing?
Strong typing implies that the types of variables involved in operations are
associated to the variable, checked at compile-time, and require explicit conversion
Weak typing implies that they are associated to the value, checked at run-time,
and are implicitly converted as required.
57. What is boxing and unboxing?
Implicit conversion of value type to reference type of a variable is known as
BOXING, for example integer to object type conversion.
Conversion of reference type variable back to value type is called as UnBoxing.
58. What is garbage collection?
Garbage collection is a system whereby a run-time component takes responsibility
for managing the lifetime of objects and the heap memory that they occupy.
59. What is serialization?
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Serialization is the process of converting an object into a stream of bytes.
Deserialization is the opposite process of creating an object from a stream of bytes.
Serialization / Deserialization is mostly used to transport objects.
60. What is the differnce between Managed code and unmanaged code?
Managed Code: Code that runs under a "contract of cooperation" with the
common language runtime. Managed code must supply the metadata necessary for
the runtimeto provide services such as memory management, cross-language
integration, code access security, and automatic lifetime control of objects. All code
based on Microsoft intermediate language (MSIL) executes as managed code.
Un-Managed Code:Code that is created without regard for the conventions and
requirements of the common language runtime. Unmanaged code executes in the
common language runtime environment with minimal services (for example, no
garbage collection, limited debugging, and so on).
61. What is difference between constants, readonly and, static?
Constants: The value can’t be changed.
Read-only: The value will be initialized only once from the constructor of the
class.
Static: Value can be initialized once.
62. What is namespace used for loading assemblies at run time and name
the methods?
System.Reflection
63. How big is the datatype int in .NET?
32 bits
64. What is difference between abstract classes and interfaces?
Abstract classes can have concrete methods while interfaces have no methods
implemented.
Interfaces do not come in inheriting chain, while abstract classes come in
inheritance.
65. In which event are the controls fully loaded?
Page_load event guarantees that all controls are fully loaded. Controls are also
accessed.
In Page_Init events but you will see that viewstate is not fully loaded during this
event.
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66. What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the
page.
67. Define RequiredFieldValidator?
It checks whether the control have any value. It's used when you want the control
should not be empty.
68. What are the different types of Session state management options
available with ASP.NET?
ASP.NET provides In-Process and Out-of-Process state management. In-Process
stores the session in memory on the web server. Out-of-Process Session state
management stores data in an external data source. The external data source may
be either a SQL Server or a State Server service. Out-of-Process state management
requires that all objects stored in session are serializable.
69. What are the difference between const and readonly?
A const can not be static, while readonly can be static.
A const need to be declared and initialized at declaration only, while a
readonly can be initialized at declaration or by the code in the constructor.
A const’s value is evaluated at design time, while a readonly’s value is
evaluated at runtime.
70. How do you turn off cookies in one page of your asp.net application?
We may not use them at the max, However to allow the cookies or not, is client
side functionality.
71. What’s the difference between Response.Write () and
Response.Output.Write()?
Response.Outout.Write allows us to write the formatted out put.
72. What is the difference between inline and code behind?
Inline code written along with the html and design blocks in an .aspx page.
Code-behind is code written in a separate file (.cs or .vb) and referenced by the
.aspx page.
73. What is the difference between early binding and late binding?
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Calling a non-virtual method, decided at a compile time is known as early binding.
Calling a virtual method (Pure Polymorphism), decided at a runtime is known as
late binding.
74. What is the difference between ASP Session and ASP.NET Session?
Asp.net session supports cookie less session & it can span across multiple servers.
75. What is Common Language Runtime?
CLR also known as Common Language Run time provides a environment in
which program are executed, it activate object, perform security check on them, lay
them out in the memory, execute them and garbage collect them.
76. What is Intermediate Language?
MSIL are also known as Microsoft Intermediate Language is the CPUindependent instruction set into which .Net framework programs are compiled. It
contains instructions for loading, storing initializing, and calling methods on objects.
77. What is CTS?
The Common type system is a rich type system, built into the common language
runtime, which supports the types and operations found in most programming
languages.
78. What is Common Langauge Specification?
CLS also known as Common Language Specification defines the rules which all
language must support, in order to be a part of .Net framework. The Common
Language Specification is a set of constructs and constraints that serves as a guide
for library writers and compiler writers.
79. Which class deals wit the user’s locale information?
System.Web.UI.Page.Culture
80. What is the lifespan for items stored in ViewState?
Items stored in a ViewState exist for the life of the current page, including the post
backs on the same page.
81. Can we disable ViewState, If, yes how?
ViewState can be disabled by using "EnableViewState" property set to false.
82. Can you give an example of what might be best suited to place in the
Application_Start and Session_Start subroutines?
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All the global declarations or the variables used commonly across the application
can be deployed under Application_Start. All the user specific tasks or declarations
can be dealt in the Session_Start subroutine.
83. What is an assembly?
Assemblies are the building blocks of the .NET framework. They are the logical
grouping of the functionality in a physical file.
84. What are different types of Assemblies?
Single file and multi file assembly.
Assemblies can be static or dynamic.
Private assemblies and shared assemblies.
85. Which method do you invoke on the DataAdapter control to load your
generated dataset with data?
DataAdapter’s fill () method is used to fill load the data in dataset.
86. Which template is to be provided in the Repeater control in order to
display a data?
ItemTemplate
AlternatingItemTemplate.
87. What are the advantages of an assembly?
Increased performance.
Better code management and encapsulation.
It also introduces the n-tier concepts and business logic.
88. What is an ArrayList?
The ArrayList object is a collection of items containing a single data type values.
89. What is a Literal Control?
The Literal control is used to display text on a page. The text is programmable.
This control does not let you apply styles to its content.
90. Which namespaces are used for data access?
System.Data
System.Data.OleDB
System.Data.SQLClient
91. What is Remoting?
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Remoting is a means by which one operating system process, or program, can
communicate with another process. The two processes can exist on the same
computer or on two computers connected by a LAN or the Internet.
92. What’s the use of “GLOBAL.ASAX” file?
It allows to executing ASP.NET application level events and setting applicationlevel variables.
93.What is a SESSION and APPLICATION object?
Session object store information between HTTP requests for a particular user.
Session variables are used to store user specific information where as in application
variables we can’t store user specific information.
while application object are global across users.
94. What is the difference between a Thread and a Process?
A thread is a path of execution that run on CPU, a proccess is a collection of
threads that share the same virtual memory.
A process have at least one thread of execution, and a thread always run in a
process context.
95. What's the difference between the Debug class and Trace class?
Documentation looks the same.
Use Debug class for debug builds.
use Trace class for both debug and release builds.
96. What’s the top .NET class that everything is derived from?
System.Object
97. How is method overriding different from overloading?
When Overriding, you change the method behavior for a derived class.
Overloading simply involves having a method with the same name within the
class.
98. What is the difference between System.String and
System.StringBuilder classes?
System.String is immutable.
System.StringBuilder was designed with the purpose of having a mutable
string where a variety of operations can be performed.
99. What is the differences between Server-side and Clientside code?
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Server side code is executed at the server side on IIS in ASP.NET framework.
while client side code is executed on the browser.
100. What’s an interface?
It’s an abstract class with public abstract methods all of which must be
implemented in the inherited classes.
101. What is a formatter?
A formatter is an object that is responsible for encoding and serializing data into
messages on one end, and deserializing and decoding messages into data on the
other end.
102. What is Marshalling?
Marshaling is a process of making an object in one process (the server)
available to another process (the client). There are two ways to achieve the
marshalling.
Marshal by value
Marshal by reference.
103. What is a Static class?
Static class is a class which can be used or accessed without creating an instance
of the class.
104. What is a DataSet?
A DataSet is an in memory representation of data loaded from any data source.
105. What are the differences between value type and reference type?
Value type contain variable and reference type are not containing value directly in
its memory.
Memory is allocated in managed heap in reference type and in value type memory
allocated in stack. Reference type ex-class value type-struct, enumeration
106. What is a DataTable?
A DataTable is a class in .NET Framework and in simple words a DataTable object
represents a table from a database.
107. What is a life span of a static variable?
A static variable’s life span is till the class is in memory
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108. What is the difference between an abstract method & virtual method?
An Abstract method does not provide an implementation and forces overriding to
the deriving class (unless the deriving class also an abstract class),
Virtual method has an implementation and leaves an option to override it in the
deriving class. Thus Virtual method has an implementation & provides the derived
class with the option of overriding it. Abstract method does not provide an
implementation & forces the derived class to override the method.
109. How many namespaces are in .NET version 1.1?
124
110. What is sealed class
Sealed classes are those classes which can not be inherited and thus any
sealed class member can not be derived in any other class.
A sealed class cannot also be an abstract class.
111. What are the components of web form in ASP.NET?
Server controls
HTML controls
Data controls
System components.
112. How do you turn off cookies for one page in your site?
Use the Cookie. Discard Property which Gets or sets the discard flag set by the
server. When true, this property instructs the client application not to save the
Cookie on the users hard disk when a session ends.
113. What is AutoPostback?
AutoPostBack automatically posts the page back to the server when state of the
control is changed.
114. What is Globalization?
Globalization is the process of creating multilingual application by defining culture
specific features like currency, date and time format, calendar and other issues.
115. What is the main difference between Asp.net and Vb.net?
Asp.net is a web technology used for designing webforms and Vb.net is a
programming language
ASP.NET is a powerful technology for writing dynamic web pages.
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ASP.NET is a way of creating dynamic web pages while making use of the
innovations present in .NET.
VB.NET is a language.But ASP.NET is the Environment where we can create
websites or webpages.
116. Is string a value type or a reference type?
Srting is a Reference type.It can create a new instance at every time.
117. What base class do all Web Forms inherit from?
System.web.UI.Page class
118. What does assert () do?
In debug compilation, assert takes in a Boolean condition as a parameter, and
shows the error dialog if the condition is false. The program proceeds without any
interruption if the condition is true.
119. What is cookie less session? How it works?
By default, ASP.NET will store the session state in the same process that processes
the request, just as ASP does. If cookies are not available, a session can be tracked
by adding a session identifier to the URL.
120. What is the difference between Compiler and Interpreter?
Compiler:
A compiler is a program that translates program (called source code) written in
some high level language into object code.A compiler translates high-level
instructions directly into machine language and this process is called compiling.
Interpreter:
An interpreter translates high-level instructions into an intermediate form, which it
then executes. Interpreter analyzes and executes each line of source code in
succession, without looking at the entire program; the advantage of interpreters is
that they can execute a program immediately.
121. What is the difference between an ADO.NET Dataset and an ADO
Recordset?
A DataSet can represent an entire relational database in memory, complete
with tables, relations, and views.
A DataSet is designed to work without any continuing connection to the
original data source.
DataSets have no current record pointer You can use For Each loops to move
through the data.
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Though the DataSet is universal, other objects in ADO.NET come in different
versions for different data sources.
Data in a DataSet is bulk-loaded, rather than being loaded on demand.
You can store many edits in a DataSet, and write them to the original data
source in a single operation.
122. What are the validation controls?
A set of server controls included with ASP.NET that test user input in HTML and
Web server controls for programmer-defined requirements. Validation controls
perform input checking in server code. If the user is working with a browser that
supports DHTML, the validation controls can also perform validation using client
script.
123. What is the difference between “Web.config” and “Machine.Config”?
“Web.config” files apply settings to each web application.
While “Machine.config” file apply settings to all ASP.NET applications.
124. What is event bubbling?
Server controls like Data grid, Data List, and Repeater can have other child
controls inside them. Example Data Grid can have combo box inside data grid.
These child control do not raise there events by themselves, rather they pass the
event to the container parent (which can be a data grid, data list, repeater), which
passed to the page as “ItemCommand” event. As the child control send events to
parent it is termed as event bubbling.
125. What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the
page.
126. Where is View State information stored?
In HTML Hidden Fields.
127. What is role based security?
By default, ASP.NET will store the session state in the same process that processes
the request, just as ASP does. If cookies are not available, a session can be tracked
by adding a session identifier to the URL.
128. What is the difference between Asp and Asp.net?
ASP (Active Server Pages) and ASP.NET are both server side technologies for
building web sites and web applications, ASP.NET is Managed compiled code - asp
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is interpreted. and ASP.net is fully Object oriented.
ASP.NET has been entirely re-architected to provide a highly productive
programming experience based on the .NET Framework, and a robust infrastructure
for building reliable and scalable web applications.
129. What are the various security methods which IIS Provides apart from
.NET?
The various security methods which IIS provides are :
Authentication Modes.
IP Address and Domain Name Restriction.
DNS Lookups DNS Lookups.
Though the DataSet is universal, other objects in ADO.NET come in different
versions for different data sources.
The Network ID and Subnet Mask.
SSL.
130. What are Master Pages in ASP.NET?
ASP.NET master pages allow you to create a consistent layout for the pages in your
application. A single master page defines the look and feel and standard behavior
that you want for all of the pages in your application. You can then create individual
content pages that contain the content you want to display. When users request the
content pages, they merge with the master page to produce output that combines
the layout of the master page with the content from the content page.
131. What are the advantages of ASP.Net?
ASP.NET makes development simpler and easier to maintain with an eventdriven, server-side programming model.
ASP.NET offers built-in security features through windows authentication or
other authentication methods.
Content and program logic are separated which reduces the inconveniences
of program maintenance.
Built-in caching features.
132. What is event bubbling?
Server controls like Data grid, Data List, and Repeater can have other child
controls inside them. Example Data Grid can have combo box inside data grid.
These child control do not raise there events by themselves, rather they pass the
event to the container parent (which can be a data grid, data list, repeater), which
passed to the page as “ItemCommand” event. As the child control send events to
parent it is termed as event bubbling.
133. What is WSDL?
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WSDL stands for Web Services Description Language is an XML-based language for
describing Web services and how to access them.
WSDL is used to describe Web services.
134. What is the use of @ Register directives?
@Register directive informs the compiler of any custom server control added to the
page.
135. What is the difference between javascript and vbscript?
Javascript :
JavaScript is a client-side scripting language.
JavaScript is used to create interactive web applications supported by the Netscape
browser.
JavaScript is simple to use, lightweight, and dynamic. Developers can easily embed
code functionality for interactive applications inside a web page.
Javascript is case sensitive and it will be run on client side.
VBScript:
VBScript is a server-side scripting language.
VBScript is not case sensitive and it will be run on server side.
136. What is a web server?
A web server delivers requested web pages to users who enter the URL in a web
browser. Every computer on the Internet that contains a web site must have a web
server program.
137. What are Cascading style sheets?
Cascading style sheets (CSS) collect and organize all of the formatting
information applied to HTML elements on a Web form. Because they keep this
information in a single location, style sheets make it easy to adjust the appearance
of Web applications.
138. What is the base class of .net?
System.object
139. What is the base class of Asp.net?
system.Web.UI
140. what is use of web.config?
Web.config is used connect database from front end to back end.
Web.config is used to maintain the Appsettimgs instead of static variables.
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141. What is difference between abstract classes and interfaces?
Abstract classes can have concrete methods while interfaces have no methods
implemented.
Interfaces do not come in inheriting chain, while abstract classes come in
inheritance.
142. What is GAC or Global Assembly Cache?
Global Assembly Cache (GAC) is a common place to share the .NET assemblies
across many applications. GAC caches all strong named assembly references within
it. All System assemblies that come with the .NET framework reside in the GAC.
143. What is a HashTable?
The Hashtable object contains items in key/value pairs. The keys are used as
indexes, and very quick searches can be made for values by searching through
their keys.
144. What is CAS or Code Access Security?
Code Access Security - CAS is the part of the .NET security model that
determines whether or not a piece of code is allowed to run, and what resources it
can use when it is running.
145. What is the Composite Custom Control?
Combination of existing HTML and Server Controls.
146. What is RangeValidator?
RangeValidator - checks whether a value falls within a given range of number, date
or string.
147. What base class do all Web Forms inherit from?
System.web.UI.Page class
148. What is the difference between System.String and
System.Text.StringBuilder classes?
System.String is immutable.
System.StringBuilder was designed with the purpose of having a mutable string
where a variety of operations can be performed.
149. How to Create a Cookie?
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Cookie are one of several ways to store data about web site visitors during the time
when web server and browser are not connected. Common use of cookies is to
remember users between visits. Practically, cookie is a small text file sent by web
server and saved by web browser on client machine.
The“Response.Cookies” command is used to create cookies.
150. How do you identify a Master Page?
The master page is identified by a special @ Master directive that replaces the @
Page directive that is used for ordinary .aspx pages.
151. Explain what a diffgram is and a good use for one?
The DiffGram is one of the two XML formats that you can use to render DataSet
object contents to XML. For reading database data to an XML file to be sent to a
Web Service.
152. What is ValidationSummary?
ValidationSummary - It show a summary of errors raised by each control on the
page on a specific spot or in a message box.
153. How do you indentify that the page is post back?
By checking the IsPostBack property. If IsPostBack is True, the page has been
posted back.
154. what are the types of ASP Objects?
There are various types of Asp objects
Session Object
Application Object
Server Object
Request Object
Request Object
Response Object
Object Context
Error Object
155. What are remotable objects in .NET Remoting?
Remotable objects are the objects that can be marshaled across the application
domains. You can marshal by value, where a deep copy of the object is created and
then passed to the receiver. You can also marshal by reference, where just a
reference to an existing object is passed.
156. What is the difference between ASP Session and ASP.NET Session?
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Asp.net session supports cookie less session & it can span across multiple servers.
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