Check whether the page is "refreshed"

[Sample of July 27] Check whether the page is "refreshed":

Sample Download : http://code.msdn.microsoft.com/CSASPNETCheckPageRefresh-9811ec12 
The CSASPNETCheckPageRefresh sample demonstrates how to check whether the page is refreshed or not. User usually wants to check whether a page is refreshed again in order to avoid some duplicated operations. In this demo, we create a user control to collect such information.

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