How can I maintain gridview page index while navigation from the form?

How can I maintain gridview page index while navigating away from the form and getting back by either the browser's back button or custom navigation button开发者_高级运维?

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Save the current index in Session or other kind of state source (db, or file system), which crosses the bounds of single form (not a ViewState for sure).

I guess Session is the best for you.