logout Code Problem

Hi All,
I am using VS2008 C# 3.5.
In that site when user clicked on Logout.
As per perfectly work the previously page can not be seen.
But in belowe code I can move to the previous page.
        Session.Abandon();
        FormsAuthentication.SignOut();
so, Plz give me solution of that.


Thanking You,
Harshad Mahant

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