Send page back with a parameter then refresh

I have a grid view with check box column as templated field, user search for an item then press a button to fill the grid then the user can check multiple rows then press a button to go to the next page to process the selection, the problem is when the user would like to change the checked box buy going back to the grid, if i redirect the page that means the user will have to search and re check all the boxes again, but if the user presses back button on the browser then then all the checked boxes are there then by refreshing the page the user can just uncheck the unwanted check box and check another one then re submit, the question is how can i use the back button from and refresh the page by code C#
UKITAsked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
you can't since the back button is something that works outside of the webpage.. nothing is sent to the browser when you hit the back button that you can intercept in your website.

The browser uses the information that it has stored locally.. all you can detect is whether or not the user leaves the page and all you can do is either cancel the action or continue the action
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UKITAuthor Commented:
Thank you David,
since I cannot do that then I will need to save all my params in sessions but I am struggling to call  this methode
protected void SelectedRecords(object sender, GridViewRowEventArgs e)
        {}
from a button on the page or from another event ?
I would appreciate any ideas as that would solve my problem.
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UKITAuthor Commented:
I do admire the professionalism and the swift help I am getting fro the experts here.
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David Johnson, CD, MVPOwnerCommented:
you can add a back button on the page that will work but if the user uses the browsers back it won't work.
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