I would like to know how I can block access to Page if the same instance of page is opened in another tab browser (in the same user session).
I have a page called Page1.aspx. User create a session and go to Page1.aspx. But he also open second tab in browser and also go to Page1.aspx. Then I would like display message eg. : "You have already opened Page1, please close it to continue."
He can open Page1.aspx,Page2.aspx,Page3.aspx in the same session but he can open again Page1.aspx after I am sure that first instance of Page1.aspx was closed.
Please don't ask me why I wont this strange funcionality :P, but I really need it.
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