[Sample of May 23th] How to clear variables on click of Back button to previous page on browser

[Sample of May 23th] How to clear variables on click of Back button to previous page on browser:

Sample Download: http://code.msdn.microsoft.com/ClearVariablesOnClickOfBack-bca322e8
Today’s code sample demonstrates how to clear variables on click of Back button to previous page on browser. Usually, if user hits browser's back button, some of the session variables still appear, user can resubmit data or manipulate again, which will lead the repeat submit or operation. here we clear out the previous page's.
For detailed introduction of the sample, please read the documentation at http://code.msdn.microsoft.com/ClearVariablesOnClickOfBack-bca322e8
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