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Checking for post back
One of the concepts around ASP.NET that seems a little strange at first sight is that of postback, put simply when you check for postback you are essentially asking if a control on the page has invoked communication with the server after the initial response. This doesn't apply to XMLHttpRequest's to the server. As a result it is common to perform an expensive set of operations once, and then refer to cached versions on subsequent postbacks to the server.
asp.net
c#
PostBack