ASP.NET INTERVIEW QUESTIONS PART-3

1) What are the ASP.NET page Life-cycle stages?

There are some stage of asp.net page Life-Cycle stages which are given below:-
Page Request

1. Start 

2. Initialization

3. Load

4. Postback even handling

5. Rendering

6. Unload

2) What is the ASP.NET Life cycle Events?

      1. PreInit

      2. Init

      3. InitComplete

      4. PreLoad

5. Load

6. Control events

7. Load complete

8. PreRender

9. PreRender Complete

10. Savestate Complete

11. Render

12. Unload

3) What is the Namespace is used for web server control in ASP.NET?

System.Web.UI.Control

4) Is Session state object encapsulate the state of browser and the client?      
Yes

5) What is protected configuration in ASP.NET?                                                        
It is used to provide secure connection string information in asp.net Application.

6) What is difference between User and Server controls?

User controls are basically created by the Developers and use it any specific application. But Server controls are built-in controls.

7) Which protocol is used to call a web services in ASP.NET?

HTTP Protocol

8) What is difference between Custom control and User control?

1.      User Control can only be used within a single application. But custom controls are assemblies (DLL Files) that can be used in multiple applications.

2.      User Control cannot add to the Toolbox in visual studio while Custom Control can be easily added to the toolbox.

3.      User Controls provide limited support to user while Custom controls provide full support to the user.

4.      User controls are less convenient to use in advance than custom controls. 

9) What is difference between web.Config file and Machine.Config file?

Web.Config file:- it is specific to a web application. We can use multiple Web.Config file in one ASP.NET application.

Machine.config:- It is specific to a machine or server. We can use only one Machine.Config on server.

10) What are the major built-in objects in ASP.NET?

The major built-in objects in ASP.NET are as follows:

Application

Session

Context

Request

Response

Server

Trace

11) How to use connection string in web.config file?

<appSettings>

<add key="msg" value="msdotnet"/>

<add key="app_con" value="data source=my-pc;integrated security=yes;database=mas"/>

</appSettings>\

Note:

1.      App settings make the code faster.

2.      It allows better codes separation and clarity.

12) What are the different types of directories used in ASP.NET?

@Page        

@Import

            @Control

            @Register

            @Reference

            @Output Cache

            @Assembly

            @Implements

13) What is Namespace used for Globalization and Localization in Asp.Net?

 System.Globalization

 System.Resources

14) How to know this website is made in asp.net, asp, jsp, html, php etc.?                

  We can see the extension of each type of web application in url bar as given below:-

  ASP.NET  ---> .aspx

  ASP   --->.asp

  java ---> .jsp

  HTML ---> .html

  PHP --->.php

But some time you have not found any extension in url bar in web application, then you have to put each extension in url bar one by one and check, if no error is found then you can easily predict that application. 

15) What is caching concepts in Asp.Net?                                                                            
Caching is a place where data is stored temporarily. This data can be stored for a specific time period on the server or client system.

16) What are the different types of caching in Asp.Net?

         Output Caching

         Fragment caching

         Data caching

17) What is different between Execute Scalar and ExecuteNonQuery?

ExecuteScalar :--> It Returns output value. It is basically used for fetching a single value.
ExecuteNonQuery:--> It does not return any value but number of rows affected by the Query. It is normally used to execute Insert and update commands.

18) Can we run Asp.Net web application without Web.Config file?

Yes.

19) What Method is used to fail the User session?

Session.abandon Method.

20) What are the ways to fire the method events in Asp.Net?                                   

Init() --> It is fired at initial level.

Load() --> It is fired when page is loaded on the server.

PreRender() --> It is fired to display the user page and html .

Unload()-->It is fired when page is loaded completely.

21) What is the Class used for sending the email in Asp.Net?                                 

 System.web.MailMessaging.class

 System.web.Mail.Smtpmail.class

22) What is Formatter in Asp.Net?                                                                                          

A Formatter is an object that is used to encoding and serializing the data into message at one end and decoding and de-serializing the data at other end. It may be server End or client end. 

23) Which configuration file is supported by all protocols in Asp.Net?

 Machine.config file.

24) Which classes are used to fetch the user's local information in Asp.Net?     
System.Web.UI.Page.Culture

25) Is View state information stored in HTML Header files in Asp.Net? 
Yes.

26) What method is used for sign out in Form based authentication? 
FormsAuthentication.Signout().

27) What is the way to authenticate the user manually in asp.net application? 

Hard code value

Web.config file

28) Which Namespace is used to perform form based authentication in Asp.Net? 
System.Web.Security

29) Which attributes and elements are used in form based authentication in web.config file?

1. Name

2. Login URL

3. Default URL

4. Timeout

5. Sliding Expiration

6. Protection

7. Path

8. Required SSL

9. Credentials

10. Authentication

30) Which Password Format Attribute does use in web.config in form based authentication?

 Clear

 SHA 1

 MD5

31) What is the use of RedirectLoginPage Method in form based authentication?
This function takes two arguments, one is for user name for which cookie is created and second one is Boolean value to specify whether cookie is persistence or Non persistence.

32) What are the basic elements used which provide security in asp.net application?

Authentication

Authorization

Confidentiality

Integrity

33) What is caching in asp.net website?                                                                             
Caching is basically used to store the data temporarily either on web server or on the client system/browser.

34) What are the two types of caching used in asp.net?                                                

1.      Application Label

2.      Session Label

35) What are the three label of caching used in asp.net?                                            

1. Page output Caching

2. Fragment caching (partial caching)

3. Data Caching

36) What is the use of VaryByCustom Attribute in Caching?

The VariByCustom attribute is used for a Custom strings according to the requirements of a user.

37) Which three main controls are used to display the Entire table data in asp.net?

1.      Grid View control

2.      Repeater control

3.      Data List Control

38) What is the difference between Repeater control, Grid View Control and Data List control in asp.net?

1. Repeater and Data List controls don't have any default layout. We specify the template   to display the data .But Grid view control has a default layout to display the data in Row and Column.

2. By default on browser side repeater control is not converted in any 'HTML' tag but Grid view and Data List controls converted in 'HTML' table tag.

3. Repeater control does not have any Predefined event to add and delete the records but Grid view and Data list Controls have this event to added and delete the records.

39) What is data Mining in Asp.Net?                                                                                 
Binding the data with control is called "data Mining".

40) What types of data mining is used in asp.net?

1. Simple Data Mining

2. Complex data mining

41) How to bind variables with controls in Design section of asp.net page?
 <asp :Label ID ="Label 1" run at ="server" Text '<%#str>' Label </asp:Label>

42) What are the two types of temporary object used for creating temporary   table in Database?

 Local temporary object

 Global temporary object

43) What is the use of HTTP Handler application in ASP.NET?

HTTP Handler is used to handle the user request for the web application resources. It is also known as request response model of web application.

44) What is the use of Details View and Form view controls in asp.net? 
These controls can be used to show and manipulate the data in asp.net. Both control show only one record a time. Details view has a default layout like grid view. But Form view has not a default layout like Data List and Repeater control. We can easily perform insert, edit, update, delete and print operations by these controls.

45) Can we attach the Master page in an Existing Form of Asp.Net? 
Yes.

46) What are the Server Controls in ASP.NET?

ASP.NET server controls are components that run on the server and encapsulate user interface and related functionality .They are used in ASP.NET code behind and pages.

47) How can differentiate web server controls and custom controls? 

Web user controls:-

1. It is easier to create.

2. It is good for static layout.

3. It provides limited support for consumers who use a visual design tool.

4. We can’t be added it to the toolbox in visual studio.

5. A separate copy of the control is required in any application.

Web custom controls:-  

1. It is harder to create.

2. It is good for dynamic layout.

3. It provides full visual design tool support for consumers.

4. It can be added to the toolbox in visual studio.

5. In the global assembly cache, only a single copy of the control is required.

48) What method is used to explicitly kill user’s session?                                                 

 We use Abandon () method for this.

49) What are the different ways we would consider sending data across page in Asp.Net?

Properties (public)  

Session                                      

50) How do implement AutoPostBack with a text box?                                                  
Set AutoPostBack properties = True;

51) What is role based Security in Asp.Net?                                                                          
A role is a named set of principles that have the same privileges with respect to security .A principal can be a member of one or more roles .Therefore; applications can use role membership to determine whether a principal is authorized to perform a request action.

52) Which are two properties used on every validation control?

  ControlToValidate

  ErrorMessage

53) How to use Session State tag in Web.config file?

We can configure session state features via the <sessionstate> section in a web.config file. The default of asp.net session is 20 minutes. We can change it from your web.config file.

We can add the following to the web.config file of an application. <session state timeout = “30”/>

54) What is AutoEvent Wirup Attribute in ASP.NET?

It is attributing of @Page Directive. By default its value is 'True' that means event of page class will be bound automatically with event handlers but if it is 'false' then we need to bind event handler with page class event manually.

55) What is Singleton and single call in .NET?                                                                       
Singleton: - these types never have more than one instance exists, all client requests are served by that instance.

Single Call:-these types always have one instance per client request. The next method invocation will be serviced by a different server instance, even if the previous instance has not yet been recycled by the system.

56) What are the Data Types supported by Range Validator Control in ASP.NET? 

  Integer

  Date 

  String

57) What is Dynamic page in ASP.NET?

C# codes provide dynamic functionality in any asp.net application.

58) What are the ways to maintain the state in ASP.NET Application?

1. Query String

2. Cookies

3. Hidden field controls

4. Session

5. Application Objects

59) What is @ Register Directives in ASP.NET?                                                                  

It informs to compiler whether any custom server control is added to the page or not.

60) How can we change timeout property for a Session Object in ASP.NET?

 We can change timeout for a session object by set the timeout property in web.config file in   asp.net application.

61) Which property is common to every validation control in ASP.NET?

 ControlToValidate

 Error Message

62) Which property is used to turn off the Cookies for a page in ASP.NET?

Cookie.Discard

63) Which Namespace is used for debugging the application in ASP.NET?

Using System.Diagnostic;

64) Which events support in HTTP Session class in ASP.NET?

1. Load event

2. Unload event

65) How to create permanent Cookies in ASP.NET Application?

Set cookie.Expirytime = MaxValue.

66) How to redirect the user to another web page without performing round trip to the

Client in ASP.NET Application?

Server.transfer();

67) What data type support in Range Validator control in Asp.Net?

  Integer

  Double

  Currency

  Date

  String

68) How can disable view state in Asp.Net?                                                                    
Set EnableViewState ='false'

69) What extension is used in web services?                                                                    
.ASPX

70) What are the different types of extension used in asp.net?

.aspx   -->web form 

.ascx   --> Web user Control

Master  --> Master Page

.edmx   --> Ado Entity Data Model

.ascx    --> Dynamic data Field

.html   ---> Html page

.mdf    --> SQL Data base

.config   --> web configuration

.asmx --> web services

.cs     ---> class file

.rpt   ---> crystal report

.xsd   --> Data set

.xml   --> XML File

71) How to Disable Client Side Script in Validation Controls?

Set property "EnablclientScript"='false'

72) Is Global.asax is used to handle the session and application state?                

Yes.

73) How to allow automatic paging in GridView, DataList and Repeater controls?

Set property of each control: - Allow paging= ‘True’.

74) Which file is known as configuration file in asp.net?

Web.config file.

75) What are web services in Asp.Net?

Web Services is service which is available over the web. A Web Service is used to implement the specific functionality to execute the business logic codes of the application. This technologies allowed to developer to create a specific component once (make only logic code) so that they can share it across the multiple application by multiple developers.

76) Which Technologies were using before web services in Asp.Net?

 Component object model (COM)

 Distributed Component object model (DCOM)

77) What are the advantage of web services over COM and DCOM Technology?

1.      Web Services are very simple in use.

2.      Web Services do not carry any state information, so that multiple requests can be processed simultaneously.

3.      Web Services are enforcing trusted connection between the server and the client.

4.      Web Services can easily use in caching feature of asp.net.

5.      With the help of Web Services, we can easily integrate asp.net web application with third party systems.

6.      Web Services is useful in security purpose as ssl and window authentication of asp.net application.

78) What is WSDL in Asp.Net?

It is known as Web Service Description Language. It is a standard used by the web service to describe what a web service can do.

WSDL is a XML-based language that defines web services. Every web service holds WSDL document that specifies the location of the web service.

79) What are elements used in WSDL Document?    

 Message

 Type

 Binding

 Port

 Port type

 Service

80) What is SOAP in Asp.Net?

It is known as Simple object access protocol. It is a standard used by the web service to send the response (or request) message to the application .It is completely XML based protocol.

81) What is DISCO.EXE File in Asp.Net?

It is known as the web service discovery tool, it is used for publishing and discovering web services.

82) What is UDDI in Asp.Net?

It is known as Universal Description, Discovery and Integration .UDDI includes four types of services.

 Web service

 Business

 Binding

 Specifications

83) What is Main Features of UDDI in Asp.Net?

1. It stores the information of web services.

2. It uses W3C & IETF standards (ex. XML, HTTP, DNS etc.).

3. It uses SOAP for communication.

4. It uses WSDL to describe interfaces to web services.

84) What are the main advantages of web services in Asp.Net?

1. It enhances the security feature of any website.

2. It takes less processing time to calculate the logic code.

3. It can easily handle multiple requests at a time simultaneously.

4. It is compatible to communicate with different platform.

5. It follows XML, HTTP Standards.