Wednesday, 21 March 2012

What is the difference between synchronous postback and asynchronous postback?

The difference between synchronous and asynchronous postback is as follows:
  • 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.

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