public ActionResult Login(LoginModel model)
        {
            if (ModelState.IsValid)
            {
                var dao    = new Model.Dao.UserDao();
                var result = dao.Login(model.UserName, Encryptor.MD5Hash(model.Password));
                if (result == 1)
                {
                    var user        = dao.GetByID(model.UserName);
                    var userSession = new UserLogin();
                    userSession.UserName = user.UserName;
                    userSession.UserID   = user.ID;

                    Session.Add(Common.CommonConstants.USER_SESSION, userSession);
                    return(RedirectToAction("Index", "Home"));
                }
                else if (result == 0)
                {
                    ModelState.AddModelError("", "Account doesn't exist!");
                }
                else if (result == -1)
                {
                    ModelState.AddModelError("", "Account locked!");
                }
                else if (result == -2)
                {
                    ModelState.AddModelError("", "Incorrect password!");
                }
                else
                {
                    ModelState.AddModelError("", "Error Login!");
                }
            }
            return(View("Index"));
        }