asp.net mvc - Acessing Value from Global Variable in MVC -

hi developing web application using mvc4 , jquery mobile. in our each controller created user session below.

public class homecontroller : basecontroller { private static user currentuser;

    public actionresult index(string name)     {        currentuser = (user)session["currentusersession"];        return view();     }     public actionresult userdetaiks()     {        string username = currentuser.userfname;        return view()      } 

}

            above created object user model , assigned session value in index method. value in currentuser lost once entered userdetails. used static while creating object. question correct? or anyother way there. please guide me. 

thanks guys 1 more doubt,

i used below code in form authenticate.

 httpcookie authcookie = request.cookies[formsauthentication.formscookiename];                 if (authcookie != null)                 {                      formsauthenticationticket authticket = formsauthentication.decrypt(authcookie.value);                      var s = new system.web.script.serialization.javascriptserializer();                     user obj = s.deserialize<user>(authticket.userdata);                      userinformation currentuser = new userinformation(obj.userid);                     currentuser.userid = obj.userid;                     currentuser.firstname = obj.userfname;                     currentuser.lastname = obj.userlname;                     currentuser.roles = obj.securitygroupname;                     currentuser.defaultwarehouseid = obj.defaultwhseidentity; eg:14                     httpcontext.current.user = currentuser;                  }    **here user can change currentuser.defaultwarehouseid  later currentuser.defaultwarehouseid = 16. when leave method. again getting value 14. can code currentuser.defaultwarehouseid 16 through out app 1 changed, please guide me.** 

since there no guarantee, index method called before userdetails method, wouldn't use static variable store user. instead each controller method should user session required.