Study Code Master | ASP.NET, C#, VB, PHP, JavaScript, JQuery, HTML 5, Database, MySql, MS-Server: CSharp

<div dir="ltr" style="text-align: left;" trbidi="on">
<div style="text-align: justify;">
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">
<div class="separator" style="clear: both; text-align: center;">
<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzDM0JKWI7SSMOA3OomOvHKHL2bYAv32vuU9HQjaH3ftijJu5Zze5260pK2RdfChTJqNecWsNNG3H8GQUZkzQgvIErGbfGpbeSawNy_LkXwaDrpCq63_UnR75uMHYwqjq9U1-BO-zFfi1k/s1600/aspnet.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img alt="50 asp.net interview questions and answers" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzDM0JKWI7SSMOA3OomOvHKHL2bYAv32vuU9HQjaH3ftijJu5Zze5260pK2RdfChTJqNecWsNNG3H8GQUZkzQgvIErGbfGpbeSawNy_LkXwaDrpCq63_UnR75uMHYwqjq9U1-BO-zFfi1k/s1600/aspnet.png" title="50 asp.net interview questions and answers" /></a></div>
1. What is ASP.Net? 
Ans: 
It is a framework developed
by Microsoft on which we can develop new generation web sites using web
forms(aspx), MVC, HTML, Javascript, CSS etc. Its successor of Microsoft Active
Server Pages(ASP). Currently there is ASP.NET 4.0, which is used to develop web
sites. There are various page extensions provided by Microsoft that are being
used for web site development. Eg: aspx, asmx, ascx, ashx, cs, vb, html, xml
etc. 
 
2. What’s the use of Response.Output.Write()? <o:p></o:p></div>
<div>
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">
Ans: 
We can write formatted output using
Response.Output.Write(). 
 
3. In which event of page cycle is the ViewState available?<o:p></o:p></div>
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">
Ans: 
After the Init() and before the
Page_Load(). 
 
4. What is the difference between Server.Transfer and Response.Redirect? 
Ans: 
In Server. Transfer page
processing transfers from one page to the other page without making a
round-trip back to the client’s browser. This provides a faster response with a
little less overhead on the server. The clients url history list or current url
Server does not update in case of Server.Transfer. 
 
Ans:   Response. Redirect is used to
redirect the user’s browser to another page or site. It performs trip back to
the client where the client’s browser is redirected to the new page. The user’s
browser history list is updated to reflect the new address. 
 
5. From which base class all Web Forms are inherited? 
Ans: 
Page class. 
 
6. What are the different validators in ASP.NET? 
Ans: 
Required field Validator 
Range Validator 
Compare Validator 
Custom Validator 
Regular expression Validator 
Summary Validator 
 
7. Which validator control you use if you need to make sure the values in
two different controls matched? 
Ans: 
Compare Validator control. 
 
8. What is ViewState? 
Ans: 
ViewState is used to retain
the state of server-side objects between page post backs. 
 
9. Where the viewstate is stored after the page postback? 
Ans: 
ViewState is stored in a
hidden field on the page at client side. ViewState is transported to the client
and back to the server, and is not stored on the server or any other external
source. 
 
10. How long the items in ViewState exists? 
Ans: 
They exist for the life of
the current page. 
 
11. What are the different Session state management options available in
ASP.NET? 
Ans: 
In-Process Out-of-Process. 
 
In-Process stores the session in memory on the web server. 
Out-of-Process Session state management stores data in an external server. The
external server may be either a SQL Server or a State Server. All objects
stored in session are required to be serializable for Out-of-Process state
management. 
 
12. How you can add an event handler? 
Ans:   Using the Attributes property
of server side control. 
 
e.g. 
 
<pre class="_codebox">[csharp]
btnSubmit.Attributes.Add(“onMouseOver”,”JavascriptCode();”)
[/csharp]
</pre>

 
13. What is caching? 
Ans: 
Caching is a technique used
to increase performance by keeping frequently accessed data or files in memory.
The request for a cached file/data will be accessed from cache instead of
actual location of that file. 
 
14. What are the different types of caching? 
Ans: 
ASP.NET has 3 kinds of caching : 
Output Caching, 
Fragment Caching, 
Data Caching. 
 
15. Which type if caching will be used if we want to cache the portion of a
page instead of whole page? 
Ans: 
 Fragment Caching: It caches
the portion of the page generated by the request. For that, we can create user
controls with the below code: 
 
 
<pre class="_codebox">[xml]
<%@ OutputCache Duration=”120″ VaryByParam=”CategoryID;SelectedID”%>
[/xml]
</pre>

 
16. List the events in page life cycle. 
Ans: 
<ul>
<li>Page_PreInit</li>
<li>Page_Init</li>
<li>Page_InitComplete</li>
<li>Page_PreLoad</li>
<li>Page_Load</li>
<li>Page_LoadComplete</li>
<li>Page_PreRender</li>
<li>Render</li>
</ul>

 
17. Can we have a web application running without web.Config file? 
Ans: 
Yes 
 
18. Is it possible to create web application with both webforms and mvc? 
Ans: 
Yes. We have to include below
mvc assembly references in the web forms application to create hybrid
application. 
 
 
<pre class="_codebox">[csharp]
System.Web.Mvc
System.Web.Razor
System.ComponentModel.DataAnnotations
[/csharp]
</pre>

 
19. Can we add code files of different languages in App_Code folder? 
Ans: 
No. The code files must be in
same language to be kept in App_code folder. 
 
20. What is Protected Configuration? 
Ans: 
It is a feature used to
secure connection string information. 
 
21. Write code to send e-mail from an ASP.NET application? 
Ans:  <o:p></o:p> 
 </div>
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">


 
<pre class="_codebox">[csharp]
MailMessage mailMess = new MailMessage ();
mailMess.From = “abc@gmail.com”;
mailMess.To = “xyz@gmail.com”;
mailMess.Subject = “Test email”;
mailMess.Body = “Hi This is a test mail.”;
SmtpMail.SmtpServer = “localhost”;
SmtpMail.Send (mailMess);
[/csharp]
</pre>

 
MailMessage and SmtpMail are classes defined System.Web.Mail namespace. 
 
22. How can we prevent browser from caching an ASPX page? 
Ans: 
We can SetNoStore on
HttpCachePolicy object exposed by the Response object’s Cache property: 
 
 
<pre class="_codebox">[csharp]
Response.Cache.SetNoStore ();
Response.Write (DateTime.Now.ToLongTimeString ());
[/csharp]
</pre>

 
23. What is the good practice to implement validations in aspx page? 
Ans: 
Client-side validation is the
best way to validate data of a web page. It reduces the network traffic and
saves server resources. 
 
24. What are the event handlers that we can have in Global.asax file? 
Ans: 
Application Events: 
 
<ul>
<li>Application_Start,</li>
<li>Application_End,</li>
<li>Application_AcquireRequestState,</li>
<li>Application_AuthenticateRequest,</li>
<li>Application_AuthorizeRequest,</li>
<li>Application_BeginRequest,</li>
<li>Application_Disposed,</li>
<li>,Application_Error,</li>
<li>Application_PostRequestHandlerExecute,</li>
<li>Application_PreRequestHandlerExecute,</li>
<li>Application_PreSendRequestContent,</li>
<li>Application_PreSendRequestHeaders,</li>
<li>Application_ReleaseRequestState,</li>
<li>Application_ResolveRequestCache, </li>
<li>Application_UpdateRequestCache</li>
</ul>
 

Session Events:  
 
<ul>
<li>Session_Start,</li>
<li>Session_End</li>
</ul>
 

25. Which protocol is used to call a Web service? 
Ans: 
HTTP Protocol<o:p></o:p></div>
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">
26. Can we have multiple web config
files for an asp.net application? 
Ans: 
Yes. 
 
27. What is the difference between web config and machine config? 
Ans: 
Web config file is specific
to a web application where as machine config is specific to a machine or
server. There can be multiple web config files into an application where as we can
have only one machine config file on a server. 
 
28. Explain role based security ? 
Ans: 
Role Based Security used to
implement security based on roles assigned to user groups in the organization. 
 
Then we can allow or deny users based on their role in the organization.
Windows defines several built-in groups, including Administrators, Users, and
Guests. 
 
 
<pre class="_codebox">[xml]
<AUTHORIZATION>< authorization >
< allow roles=”Domain_Name\Administrators” / > < !– Allow
Administrators in domain. — >
< deny users=”*” / > < !– Deny anyone else. — >
< /authorization >
[/xml]
</pre>
<o:p></o:p> 
 </div>
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">
29. What is Cross Page Posting? 
Ans: 
When we click submit button
on a web page, the page post the data to the same page. The technique in which
we post the data to different pages is called Cross Page posting. This can be
achieved by setting POSTBACKURL property of the button that causes the
postback. Findcontrol method of PreviousPage can be used to get the posted
values on the page to which the page has been posted. 
 
30. How can we apply Themes to an asp.net application? 
Ans: 
We can specify the theme in
web.config file. Below is the code example to apply theme: 
 
 
<pre class="_codebox">[xml]
<configuration>
 <system.web>
 <pages theme=”Windows7″ />
 </system.web>
</configuration>
[/xml]</pre>

 
31. What is RedirectPermanent in ASP.Net? 
Ans: 
RedirectPermanent Performs a
permanent redirection from the requested URL to the specified URL. Once the
redirection is done, it also returns 301 Moved Permanently responses. 
 
32. What is MVC? 
Ans: 
MVC is a framework used to
create web applications. The web application base builds on
Model-View-Controller pattern which separates the application logic from UI,
and the input and events from the user will be controlled by the Controller. 
 
33. Explain the working of passport authentication. 
Ans: 
First of all it checks
passport authentication cookie. If the cookie is not available then the
application redirects the user to Passport Sign on page. Passport service
authenticates the user details on sign on page and if valid then stores the
authenticated cookie on client machine and then redirect the user to requested
page 
 
34. What are the advantages of Passport authentication? 
Ans: 
All the websites can be
accessed using single login credentials. So no need to remember login
credentials for each web site. 
 
Users can maintain his/ her information in a single location. 
 
35. What are the asp.net Security Controls?  
Ans: 
<ul>
<li><asp:Login>: Provides a standard login capability that allows the users
to enter their credentials </li>
<li><asp:LoginName>: Allows you to display the name of the logged-in user </li>
<li><asp:LoginStatus>: Displays whether the user is authenticated or not </li>
<li><asp:LoginView>: Provides various login views depending on the selected
template </li>
<li><asp:PasswordRecovery>: email the users their lost password </li>
</ul>

36: How do you register JavaScript for webcontrols ? 
Ans: 
We can register javascript
for controls using  
<CONTROL- name> Attribtues.Add(scriptname,scripttext)
method.<o:p></o:p></div>
<div class="MsoNormal" style="margin-bottom: 0.0001pt;">
 
37. In which event are the controls fully loaded? 
Ans:  
Page load event. 
 
38. what is boxing and unboxing? 
Ans: 
Boxing is assigning a value
type to reference type variable. 
Unboxing is reverse of boxing ie. Assigning reference type variable to value
type variable. 
 
39. Differentiate strong typing and weak typing? 
Ans: 
In strong typing, the data
types of variable are checked at compile time. On the other hand, in case of
weak typing the variable data types are checked at runtime. In case of strong
typing, there is no chance of compilation error. Scripts use weak typing and
hence issues arises at runtime. 
 
40. How we can force all the validation controls to run? 
Ans: 
The Page.Validate() method is
used to force all the validation controls to run and to perform validation. 
 
41. List all templates of the Repeater control.  
Ans: 
<ul>
<li>ItemTemplate </li>
<li>AlternatingltemTemplate </li>
<li>SeparatorTemplate </li>
<li>HeaderTemplate </li>
<li>FooterTemplate </li>
</ul>

 
42. List the major built-in objects in ASP.NET? Ans; 
<ul>
<li>Application </li>
<li>Request </li>
<li>Response </li>
<li>Server </li>
<li>Session </li>
<li>Context </li>
<li>Trace </li>
</ul>

 
43. What is the appSettings Section in the web.config file? 
Ans: 
The appSettings block in web
config file sets the user-defined values for the whole application. 
 
For example, in the following code snippet, the specified ConnectionString
section is used throughout the project for database connection: 
 
 
<pre class="_codebox">[csharp]
<configuration>
<appSettings>
<add key=”ConnectionString” value=”server=local; pwd=password;
database=default” />
</appSettings>
[/csharp]
</pre>

 
44. Which data type does the RangeValidator control support? 
Ans:  
The data types supported by
the RangeValidator control are Integer, Double, String, Currency, and Date. 
 
45. What is the difference between an HtmlInputCheckBox control and
an HtmlInputRadioButton control? 
Ans: 
In HtmlInputCheckBoxcontrol,
multiple item selection is possible whereas in HtmlInputRadioButton controls,
we can select only single item from the group of items. 
 
46. Which namespaces are necessary to create a localized application? Ans:  
<ul>
<li>System.Globalization</li>
<li>System.Resources</li>
</ul>

 
47. What are the different types of cookies in ASP.NET? 
Ans:    
Session Cookie – Resides on
the client machine for a single session until the user does not log out. Persistent Cookie – Resides
on a user’s machine for a period specified for its expiry, such as 10 days, one
month, and never. 
 
48. What is the file extension of web service? 
Ans:  
Web services have file
extension .asmx.. 

 
49. What are the components of ADO.NET? 
Ans:  
The components of ADO.Net are
Dataset, Data Reader, Data Adaptor, Command, connection. 
 
50. What is the difference between ExecuteScalar and ExecuteNonQuery? 
Ans: 
ExecuteScalar returns output
value where as ExecuteNonQuery does not return any value but the number of rows
affected by the query. ExecuteScalar used for fetching a single value and
ExecuteNonQuery used to execute Insert and Update statements.<o:p></o:p></div>
<div class="MsoNormal">
 </div>
</div>
</div>
</div>

50 ASP.NET interview questions and answers

1. What is ASP.Net? Ans: It is a framework developed by Microsoft on which we can develop new generation web sites using web forms(as...

Study Code Master | ASP.NET, C#, VB, PHP, JavaScript, JQuery, HTML 5, Database, MySql, MS-Server

Write a program of Bulk Copy in C#

50 ASP.NET interview questions and answers

What is LINQ ?

Popular Posts

Blog Archive