public ActionResult AddAlerta(Alerta obj)
 {
     if (!this.currentUser())
     {
         return(RedirectToAction("Ingresar", "Login"));
     }
     try
     {
         if (ModelState.IsValid)
         {
             if (obj.IdAlerta == 0)
             {
                 if (dal.AddAlerta(obj) > 0)
                 {
                     return(RedirectToAction("Index"));
                 }
             }
             else
             {
                 if (dal.UpdateAlerta(obj))
                 {
                     return(RedirectToAction("Index"));
                 }
             }
         }
     }
     catch (Exception ex)
     {
         throw;
     }
     TempData["Alerta"] = obj;
     return(RedirectToAction("Index"));
 }