1. What is ASP.Net?
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()? We can write formatted output using Response.Output.Write().
3. In which event of page cycle is
the ViewState available? After
the Init() and before
the Page_Load().
4. What is
the difference between Server.Transfer and Response.Redirect?
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.
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?
Page class.
6. What are
the different validators in ASP.NET?
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?
Compare Validator control.
8. What is ViewState?
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?
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?
They exist for
the life of
the current page.
11. What are
the different Session state management options available in ASP.NET?
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?
Using the Attributes property of server side control.
e.g.
[csharp]
btnSubmit.Attributes.Add(“onMouseOver”,”JavascriptCode();”)
[/csharp]
13. What is caching?
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?
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?
Fragment Caching: It caches
the portion of the page generated by
the request. For that, we can create user controls with
the below code:
[xml]
<%@ OutputCache Duration=”120? VaryByParam=”CategoryID;SelectedID”%>
[/xml]
16. List
the events in page life cycle.
1) Page_PreInit
2) Page_Init
3) Page_InitComplete
4) Page_PreLoad
5) Page_Load
6) Page_LoadComplete
7) Page_PreRender
8)Render
17. Can we have a web application running without web.Config file?
Yes
18. Is it possible to create web application with both webforms and mvc?
Yes. We have to include below mvc assembly references in
the web forms application to create hybrid application.
[csharp]
System.Web.Mvc
System.Web.Razor
System.ComponentModel.DataAnnotations
[/csharp]
19. Can we add code files of different languages in App_Code folder?
No.
The code files must be in same language to be kept in App_code folder.
20. What is Protected Configuration?
It is a feature used to secure connection string information.
21. Write code to send e-mail from an ASP.NET application?
[csharp]
MailMessage mailMess = new MailMessage ();
mailMess.From = “
[email protected]”;
mailMess.To = “
[email protected]”;
mailMess.Subject = “Test email”;
mailMess.Body = “Hi This is a test mail.”;
SmtpMail.SmtpServer = “localhost”;
SmtpMail.Send (mailMess);
[/csharp]
MailMessage and SmtpMail are classes defined System.Web.Mail namespace.
22. How can we prevent browser from caching an ASPX page?
We can SetNoStore on HttpCachePolicy object exposed by
the Response object’s Cache property:
[csharp]
Response.Cache.SetNoStore ();
Response.Write (DateTime.Now.ToLongTimeString ());
[/csharp]
23. What is
the good practice to implement validations in aspx page?
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?
Application Events: Application_Start , Application_End, Application_AcquireRequestState, Application_AuthenticateRequest, Application_AuthorizeRequest, Application_BeginRequest, Application_Disposed, Application_EndRequest, Application_Error, Application_PostRequestHandlerExecute, Application_PreRequestHandlerExecute,
Application_PreSendRequestContent, Application_PreSendRequestHeaders, Application_ReleaseRequestState, Application_ResolveRequestCache, Application_UpdateRequestCache
Session Events: Session_Start,Session_End
25. Which protocol is used to call a Web service?
HTTP Protocol
26. Can we have multiple web config files for an asp.net application?
Yes.
27. What is
the difference between web config and
machine config?
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 ?
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.
[xml]
<AUTHORIZATION>< authorization >
< allow roles=”Domain_Name\Administrators” / > < !– Allow Administrators in domain. — >
< deny users=”*” / > < !– Deny anyone else. — >
< /authorization >
[/xml]
29. What is Cross Page Posting?
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?
We can specify
the theme in web.config file. Below is
the code example to apply theme:
[xml]
<configuration>
<system.web>
<pages theme=”Windows7? />
</system.web>
</configuration>
[/xml]
31: What is RedirectPermanent in ASP.Net?
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?
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.
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?
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?
<asp:Login>: Provides a standard login capability that allows
the users to enter their credentials
<asp:LoginName>: Allows you to display
the name of
the logged-in user
<asp:LoginStatus>: Displays whether
the user is authenticated or not
<asp:LoginView>: Provides various login views depending on
the selected template
<asp:PasswordRecovery>: email
the users their lost password
36: How do you register JavaScript for webcontrols ?
We can register javascript for controls using <CONTROL -name>Attribtues.Add(scriptname,scripttext) method.
37. In which event are
the controls fully loaded?
Page load event.
38: what is boxing and unboxing?
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
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?
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.
ItemTemplate
AlternatingltemTemplate
SeparatorTemplate
HeaderTemplate
FooterTemplate
42. List
the major built-in objects in ASP.NET?
Application
Request
Response
Server
Session
Context
Trace
43. What is
the appSettings Section in the web.config file?
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:
[csharp]
<em><configuration>
<appSettings>
<add key=”ConnectionString” value=”server=local; pwd=password; database=default” />
</appSettings></em>
[/csharp]
44. Which data type does the RangeValidator control support?
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 anHtmlInputRadioButton control?
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?
System.Globalization
System.Resources
47. What are
the different types of cookies in ASP.NET?
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?
Web services have file extension .asmx..
49. What are
the components of ADO.NET?
The components of ADO.Net are Dataset, Data Reader, Data Adaptor, Command, connection.
50. What is
the difference between ExecuteScalar and ExecuteNonQuery?
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.
