The problem you are having is your application is not maintaining session state. I recently had to do some major fanagling to maintain checkbox state using a control as I would go back and forth between pages. Take a look at this thread as it might give
you some clues on how to maintain your gridview stuff.
bbcompent1
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Re: Gridview not appearing between views in multiview
Apr 30, 2012 04:21 PM|LINK
The problem you are having is your application is not maintaining session state. I recently had to do some major fanagling to maintain checkbox state using a control as I would go back and forth between pages. Take a look at this thread as it might give you some clues on how to maintain your gridview stuff.
http://forums.asp.net/t/1741010.aspx/1?Paging+through+gridview+clears+selected+checkboxes