.Net Interview Questions and Answers

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.

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.

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