Asynchronous and synchronous PostBack

Hi Sharad,


Asynchronous postback renders only the required part of the page; whereas, synchronous postback renders the entire page for any postback.
Asynchronous postback executes only one postback at a time, that is, if you have two buttons doing asynchronous postback, the actions will be performed one by one; whereas, synchronous postback executes all the actions at once.
Asynchronous postback only modifies the update panel that raises the postback; whereas, synchronous postback modifies the entire page.

Please refer the below links

http://forums.asp.net/t/1189942.aspx/1?Difference+between+Synchronous+amp+Asynchronous

http://stackoverflow.com/questions/2278891/asynchronous-and-synchronous-postback-in-asp-net

Thanks