I found out that when pressing back button it gets previous page from browser cache even if I send following headers:
Test1.aspx
Server              ASP.NET Development Server/9.0.0.0
Date         Wed, 24 Mar 2010 17:49:40 GMT
X-AspNet-Version 2.0.50727
Location         Test2.aspx
Cache-Control no-cache, no-store
Pragma         no-cache
Expires         -1
Content-Type text/html; charset=utf-8
Content-Length 189
Connection         Close
                expires should be a date+timestamp and cache-control"s "must-revalidata" & "max-age" might help as well?
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control: no-cache, must-revalidate, max-age=0
                        Cache-control and such things only tell browser NOT to save in cache the downloaded stuff (js, css, images, etc.). It does not relate with the History of visited pages.
You shouldn't try to modify browser's data. Instead, you'd handle events and stop the ones you don't want to happen in your site.
For me the following setting in the header worked:
Pragma: no-cache
Cache-Control: no-cache, no-store
Expires: 0
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