c# - Session get null After login immediately in ASP.NET MVC 5 -

on login assigning values session after login becomes null. set session timeout still doesn't work.

   public actionresult login([bind(include = "username, password")] loginmodel loginmodel, string returnurl)     {         if (modelstate.isvalid)         {             egov_users egov_users = db.egov_users                 .where(p => p.usertype.type != "o" && p.username == loginmodel.username)                 .firstordefault();              if (egov_users == null)             {                 modelstate.addmodelerror("", "invalid username");                 return view();             }             else             {                 if (egov_users.password != loginmodel.password)                 {                     modelstate.addmodelerror("", "invalid password");                     return view();                 }                  var logindetail = new logindetails();                  logindetail.supplierid = (egov_users.supplierid != null) ? egov_users.supplierid.value : 0;                 logindetail.userid = egov_users.userid;                 logindetail.username = egov_users.username;                 logindetail.firstname = egov_users.firstname;                 logindetail.lastname = egov_users.lastname;                  session["userid"] = logindetail.userid;                 session["supplierid"] = logindetail.supplierid;                 session["username"] = logindetail.username;                 session["displayname"] = logindetail.firstname + " " + logindetail.lastname;                 if (string.isnullorempty(returnurl))                 {                     return redirecttoaction("index", "users");                 }             }         }          return redirecttoaction("login", "login");     } 

in webconfig have set session timeout well.

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