public ActionResult Login(LoginModel model)
        {
            if (ModelState.IsValid)
            {
                var dao    = new AdminFunction();
                var result = dao.Login(model.UserName, model.Password);
                if (result != 0)
                {
                    var admin        = dao.GetById(model.UserName);
                    var adminSession = new AdminLogin();
                    adminSession.UserName = admin.UserName;
                    adminSession.id       = admin.id;
                    Session.Add(CommonConstant.ADMIN_SESSION, adminSession);

                    CommonConstant.ADMINNAME = adminSession;
                    return(Redirect("/ADMIN"));
                }
                else
                {
                    ModelState.AddModelError("", "Tài khoản không tồn tại");
                }
            }
            return(View(model));
        }