private void LoadCmbSach() { var cmb = cbSach; clsDM_Sach cls = new clsDM_Sach(); DataTable dt = cls.SelectAll(); dt.DefaultView.RowFilter = "TonTai = 1"; dt = dt.DefaultView.ToTable(); cmb.DataSource = dt; cmb.ValueMember = "ID_Sach"; cmb.DisplayMember = "Ten_Sach"; }