Refreshing the page will also bring a not-authenticated page (whatever you set up for that).
You can disable client-side caching (in browsers that pay attention to such things, I'm not sure they all do) with the Pragma, Cache-Control and Expires headers; Dylan posted a good link for how to set those with C#. But if you do that, the back button even while you're logged in will cause page refreshes/reloads, making it impossible for the user to use back/forward through the client-side cache.
There are a few high security situations where you can justify this behavior. I very much doubt you're working in any of those,
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