The default behavior of asynchronous postbacks is that the most recent asynchronous postback takes precedence. If two asynchronous postbacks occur in sequence, and if the first postback is still being processed in the browser, the first postback is canceled. If the first postback has been sent to the server, the server processes the second request when it arrives and does not return the first request.
You can also use JavaScript and the PageRequestManager class to customize partial-page updates on a page. For example, you can write script to give precedence to a specific asynchronous postback if more than one is underway. You can also enable users to cancel postbacks that are in progress.
And this is a more decent the solution than M$
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