Restricting User to View page after log out

[Kuldeep Bhatnagar]

Hello, In my ASP site i want to implement the security that when the user clicks on logout then when he clicks on back button he should not be able to access the previous page again. I have used the session variable "User", it's vale is true if the user is logged in and make it false when the user logsout. I every page i am checking that if the value is false then the user should be redirected to login page. But when user clicks on back button of browser, it does not work. Can anybody help out for the solution of this. Kuldeep