Aborting the Previous Asynchronous Postback
You can explicitly abort a previous asynchronous postback by using the PageRequestManager abortPostBack() method. Explicitly aborting a postback is useful when you want to associate a Cancel button with an asynchronous postback (see Figure 38.11).
Figure 38.11. Aborting an asynchronous postback with a Cancel button.
For example, the page in Listing 38.15 contains two buttons. The first button retrieves your fortune. The oracle, however, is slow. It takes 3 seconds for the oracle to deliver a new fortune. If you want to cancel the new fortune during these 3 seconds, you can click the Cancel button.
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