public void Luu_PhieuBanHang(TextBox MaPBH, ComboBox MaKH, ComboBox MaNV, DateTimePicker NgayLap, TextBox TT)
        {
            PhieuBanHangData pbhdata = new PhieuBanHangData();
            DataTable        dt      = pbhdata.LayDSPBH();

            DataRow row = dt.NewRow();

            row[0] = MaPBH.Text;
            row[1] = MaKH.SelectedValue;
            row[2] = MaNV.SelectedValue;
            row[3] = NgayLap.Value.Date;
            row[4] = TT.Text;

            dt.Rows.Add(row);
            pbhdata.Update();
        }
        public void Luu_CTPhieuBanHang(ListView lv)
        {
            PhieuBanHangData pbhdata = new PhieuBanHangData();
            DataTable        dt      = pbhdata.LayDSCTPBH();

            foreach (ListViewItem item in lv.Items)
            {
                DataRow row = dt.NewRow();
                row[0] = item.SubItems[1].Text.ToString();
                row[1] = item.SubItems[6].Text.ToString();
                row[2] = item.SubItems[3].Text.ToString();
                row[3] = item.SubItems[4].Text.ToString();
                row[4] = item.SubItems[5].Text.ToString();

                dt.Rows.Add(row);
            }
            pbhdata.Update();
        }