public ActionResult Index(user u)
        {
            inventoryDBEntities obj = new inventoryDBEntities();
            var data = obj.st_getLoginDetails(u.u_username, u.u_password);

            foreach (var item in data)
            {
                if (item.Username == u.u_username && item.Password == u.u_password)
                {
                    string r = obj.st_getRoleWRTuser(u.u_username).Single();
                    Session["role"] = r;
                    Session["name"] = u.u_username;
                    return(RedirectToAction("Main"));
                }
                else
                {
                }
            }
            return(View());
        }