private void LoadAllDocument_Type() { List <OLD_DOCK_TYPE> doctype = _basicService.LoadAllOLD_DOCK_TYPE(_businessParam).OrderBy(c => c.NAME).ToList(); doctype.Insert(0, new OLD_DOCK_TYPE { NAME = "---", ID_OLD_DOCK_TYPE = -1 }); cboDocType.DataSource = doctype; cboDocType.DisplayMember = "NAME"; cboDocType.ValueMember = "ID_OLD_DOCK_TYPE"; }