Which means you're using two cookies: The Forms Auth cookie and the Session cookie...
FWIW, you can store auth-info in the FormAuthentication cookie so you can avoid the use of the Session object.
+++ Rick ---
>>I would like to obtain your feedback as to know if you are still using cookies when developing a Web site to keep the authentication? Either as http or https, I would like to know if you prefer to pass the authentication in a query string, by some kind of encrypted (or not) session ID, at every hit instead.
>
>I always use Forms authentication with authentication info in the Session object (standard Forms authentication).