I have added some output code on this page for you to test with. When you get to this page you should see a message that says:
The values in the session before destoying are:
It should list all of the session variables and their values. After this on the page you should see another message that says:
The values in the session after destoying are:
It should then list all of the session values that are present at that point. Please post back and let us know what results you get.