session problem in asp.net

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ASP.NET4

I have taken a value in session e.g session(city)="Texas"
and also using another session in website on other pages.

Example:-<br />
On 1st Page :--<br />
<br />
session(city)="Texas"<br />
<br />
 On  2nd Page :--<br />
<br />
On Pageload <br />
Session(user)=""

In Some Page ,if a person log out then it redirect's to the 2nd Page where session(user)=""
but it shows Texas in Label .
So Can i Take more values in session

eg <br />
session(user)<br />
session(city)<br />
session(123) etc 

or we can take only one session in Particular website .
if Anybody know Better on session reply.
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if Someone don't understand what i ask then also reply ,so i correct my question.