private void LoadPropetyTypes() { List <PROPERTY_TYPE> ptypes = _basicService.LoadAllPROPERTY_TYPE(_businessParam).OrderBy(c => c.NAME).ToList(); ptypes.Insert(0, new PROPERTY_TYPE { NAME = "---", ID_PROPERTY_TYPE = -1 }); cboPropertyType.DataSource = ptypes; cboPropertyType.DisplayMember = "NAME"; cboPropertyType.ValueMember = "ID_PROPERTY_TYPE"; }