when one user is logined another user name is displaying in the master page

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ASP.NET

Dear Friends,

I am using VS2008,asp.net,c# web application.
When users are logined simultaneously, the session values are changing among users.
that means , username of logined user is displaying in master page.
the issue is when one user is logined another user name is displaying in the master page
The code used in login page is mentioned below
username is displaying

Session["PSFusrCode"] = DSUSERLEVEl.Tables[0].Rows[0]["usrCode"].ToString();



                   Session.Add("Module", Convert.ToString(Session["Module"]));


                   Session["PSFUserType"] = DSUSERLEVEl.Tables[0].Rows[0]["ulName"].ToString();
                   Session["PSFUName"] = DSUSERLEVEl.Tables[0].Rows[0]["usrName"].ToString();

                   Session["PSFOutlet"] = DSUSERLEVEl.Tables[0].Rows[0]["usrOutlet"].ToString();

thanks in advance
george