public void fillIntoCombo() { DataTable tbl = new DataTable(); tbl = BLL.fillComboNV(); cbxMaNV.DataSource = tbl; cbxMaNV.ValueMember = "MaNV"; cbxMaNV.DisplayMember = "MaNV"; tbl = BLL.fillComboKH(); cbxMaKH.DataSource = tbl; cbxMaKH.ValueMember = "MaKH"; cbxMaKH.DisplayMember = "MaKH"; }