A brand new instance of the site class is done each and every time the page is posted on the server. In traditional Web programming, this would typically imply all information associated with the page as well as the controls for the page can be lost each and every round trip. As an example, if the user enters information in to a text box, that information would be lost in the round trip through the browser or client device towards the server. ASP.NET includes several features which help you preserve data on both a per page.
http://programmingunit.com/2013/10/19/state-management-asp-net/
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