public ActionResult Add(tb_user_model model)
 {
     return this.Visit(Core.EnumUserRole.Admin, () =>
     {
         using (DbConn PubConn = DbConfig.CreateConn(Config.TaskConnectString))
         {
             PubConn.Open();
             tb_user_dal dal = new tb_user_dal();
             model.usercreatetime = DateTime.Now;
             model.usertel = model.usertel.NullToEmpty();
             model.useremail = model.useremail.NullToEmpty();
             if (model.id == 0)
                 dal.Add(PubConn, model);
             else
                 dal.Edit(PubConn, model);
         }
         return RedirectToAction("index");
     });
 }