Logout is not working correctly

Hello
i own create a login form i am not using ASP.Net Login tool....there i store value in session and check that in other main page where validation is require...its working fine once...but if i type page's name in browser directly to test  my security.....that page is open ....i thought that there may b problem in my code code....but its not my code's problem its page's problem....page_load even does not fire that time....i am surprised....page is opening but page_load event does not fire..........please help me.....


Thanks
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