public ActionResult Login(LoginModel lm)
 {
     if (ModelState.IsValid)
     {
         var dao    = new AdminDao();
         var result = dao.CheckLogin(lm.userName, lm.passWord);
         if (result)
         {
             Session.Add(Common.CommonConstants.ADMIN_SESSION, lm.userName.ToString());
             return(RedirectToAction("Index", "Main"));
         }
     }
     return(View("Index"));
 }