private void display_ct2(int ID)
        {
            DataTable table = new DataTable();

            table.Columns.Add("ID Hàng");
            table.Columns.Add("Số Lượng");

            if (cob2.SelectedIndex == 0)
            {
                List <ChiTietDonNhapHang> list = ChiTietDonNhapHang_BUL.getAllList_IDDN(ID);
                foreach (ChiTietDonNhapHang tr in list)
                {
                    table.Rows.Add(tr.IDHangHoa, tr.SoLuong);
                }
            }
            else if (cob2.SelectedIndex == 1)
            {
                List <ChiTietDonTraHangNCC> list = ChiTietDonTraHang_BUL.getAllList_IDDT(ID);
                foreach (ChiTietDonTraHangNCC tr in list)
                {
                    table.Rows.Add(tr.IDHangHoa, tr.SoLuong);
                }
            }
            dtgvct2.DataSource = table;
        }
        private void btn_yeucaunhaphang_Click(object sender, EventArgs e)
        {
            DonNhapHang dnh = new DonNhapHang()
            {
                LyDo     = txt_lydo.Text,
                NguoiLap = this.NhanVien.ID,
                NCC      = ((NhaCungCap)comb_ncc.SelectedItem).ID,
                NgayLap  = DateTime.Now
            };
            DonNhapHang kq = DonNhapHang_BUL.Them(dnh);

            if (kq != null)
            {
                bool rs1 = ChiTietDonNhapHang_BUL.themList(kq.ID, this.ListChiTietDNH);
                if (rs1)
                {
                    MessageSucess();
                }
                else
                {
                    MesageFaild();
                }
            }
            else
            {
                MesageFaild();
            }
        }