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Disable back button of browser

To disable the back button of browser (internet explorer, Microsoft) and to clear the cache


write this two line of code in your pageload event

Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.Cache.SetNoStore()

The above two lines will clear cache of the last visited page.

now on every page i think you must be checking that a particular user is logged in or not (with session variable).

if user=session("usersession") then

response.redirect("~/Next page.aspx", False)
else
response.redirect("~/Loginpage.aspx", False)
endif
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