security - "Log In As" with ASP - preventing going back -

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I have a feature in an ASP app, where a user "enters" as someone else (teacher check Interfaces, etc.) The problem is that when they press the back button and then try to use things as a trainer.

What is the best way to stop it? Is there a way to stop them from going back to those pages? I check on the individual pages for authorization, but I wonder if there is no one more beautiful.

You have to expire the cache, each page has the following requirements that require authentication. : 

  Response Adhider "Purgama", "No-Store" Response. Catch Control = "No-Store" Response Experience -1 - 1

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