Disabling Back button in ASP.NET

In your application you might come across the situation where you need to disable back button. For example if you consider this scenario, user gets data which can change frequently from database to display it in the screen. From that screen user can go another page where he presses back button of browser to come back to this page again. During that time browser might show the page which is in cache because of which user might not see the approriate data.

To avoid this you can open the browser without toolbar. So that user wont see the back button. But in lots of cases we cant do this. Other way for doing this is, dont cache the page. So everytime any page is requested it will go to the server. Hence user will get the current data.

For avoiding page to be cached, you need to set the following properties for response object.

Response.Buffer = True
Response.ExpiresAbsolute = Now().Subtract(New TimeSpan(1, 0, 0, 0))
Response.Expires = 0
Response.CacheControl = "no-cache"

ExpiresAbsolute : Gets or sets the absolute date and time at which to remove cached information from the cache.

Expires : Gets or sets the number of minutes before a page cached on a browser expires. If the user returns to the same page before it expires, the cached version is displayed.

CacheControl : Sets the Cache-Control HTTP header to Public or Private. Possible values:

Public - may be cached in public shared caches
Private - may only be cached in private cache
no-cache - may not be cached
no-store - may be cached but not archived

Courtesy: http://www.extremeexperts.com