public static void GetDataSource(ComboBox box, string disPlaymember) { barCodeDao.Bll.ProductChoiseBll _bll = new barCodeDao.Bll.ProductChoiseBll( ); DataTable da = _bll.GetListOnly( ); if (da != null && da.Rows.Count > 0) { box.DisplayMember = disPlaymember; box.DataSource = da.Copy( ).DefaultView.ToTable(true, disPlaymember); } }