public ActionResult ChangeRole(string UserId, UserModel model)
        {
            if (ModelState.IsValid)
            {
                var info = DBBridge.EditRole(UserId, model.Role);

                if (info == 1)
                {
                    ViewBag.Message = "The user role is changed successfully!";
                }
                else
                {
                    ViewBag.Message = "The user role cannot be changed!";
                }
            }

            return(View());
        }