private void LoadCadastralZone() { List <CADASTRAL_ZONE> cadastralZone = _basicService.LoadAllCADASTRAL_ZONE(_businessParam).OrderBy(c => c.NAME).ToList(); cadastralZone.Insert(0, new CADASTRAL_ZONE { NAME = "---", ID_CADASTRAL_ZONE = -1 }); cboRegionZone.DataSource = cadastralZone; cboRegionZone.DisplayMember = "NAME"; cboRegionZone.ValueMember = "ID_CADASTRAL_ZONE"; }