How to find whether the user clicks browser back button or Refresh button

Question

I need to find whether the user clicking the browser back button or Refresh button.

I need to redirect the page to Error page when he clicks the back or refresh button.

Answer 1

.NET 3.5 can very well handle the browser back (and forward) buttons. Search with Google: "Scriptmanager EnableHistory". You can control which user actions will add an entry to the browser's history (ScriptManager -> AddHistoryPoint) and your ASP.NET application receives an event whenever the user clicks the browser Back/Forward buttons.