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Home >> Interview Question >> ASP.Net >> Post New Question Subscribe to Interview Questions

What is Postback?

Posted By :shahin     Posted Date :November 22, 2009    Points :10   Category :ASP.Net 
When an action occurs (like button click), the page containing all the controls within the <FORM... > tag performs an HTTP POST, while having itself as the target URL. This is called Postback.

You can also find related Interview Question to What is Postback?  below: 

Does ViewState is responsible for maintaining data across the Page Post Back for Postback controls (like textbox, dropdownlist) and non-postbackcontrols(like label)?

  
It is false. For NonPostback controls it is true but for postback controls, ASP.NET retrieves their values one by one from the HTTP request and copies them to the control values while creating the HTTP response. (More...)

What is the concept of Postback in ASP.NET.

  
A postback is a request sent from a client to server from the same page user is already working with.

ASP.NET was introduced with a mechanism to post an HTTP POST request back to the same page. It's basically posting a complete page back to server (i.e. sending all of its data) on same page. So, the whole page is refreshed. (More...)

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