Asynchronous and synchronous PostBack

Question

What is difference between synchronous Post Back and Asynchronous Post Back

Satyapriya Nayak · Answer

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