private void buttonAdd_Click(object sender, EventArgs e)
 {
     try
     {
         Operator o    = GetFromForm();
         var      curr = CurrentOp;
         if (curr != null)
         {
             o.Id = curr.Id;
             facade.UpdateOperator_Validating(o);
         }
         else
         {
             facade.AddOperator_Validating(o);
         }
         Clear();
     }
     catch (ValidatingException ex)
     {
         Msg.ShowException(ex);
     }
 }