|S.No||Asynchronous Postback||Synchronous Postback|
Synchronous postback renders the entire page for any postback.
|2||Asynchronous postback executes only one postback at a time, that is, if we have two buttons doing asynchronous postback, the actions will be performed one by one.||
Synchronous postback executes all the actions at once.
|3||Asynchronous postback only modifies the update panel that raises the postback.||Synchronous postback modifies the entire page.|