//click button thêm sẽ sang frm_hoadonbosung
        private void btn_themhd_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            frm_Hoadonbosung hdbs = new frm_Hoadonbosung(strConnect);

            hdbs.btn_capnhat.Enabled = false;
            hdbs.Show();
        }
        //click button sẽ sang frm_hoadonbosung thực hiện chức năng cập nhật hóa đơn
        private void btn_capnhathd_ItemClick_1(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            frm_Hoadonbosung hdbs = new frm_Hoadonbosung(strConnect);

            hdbs.Show();

            hdbs.txt_mahienthi.Text = dgv_hoadonbs.GetRowCellValue(dgv_hoadonbs.FocusedRowHandle, "hienthima").ToString();
            hdbs.txt_soluong.Text   = dgv_hoadonbs.GetRowCellValue(dgv_hoadonbs.FocusedRowHandle, "soluong").ToString();
            hdbs.txt_nguoicap.Text  = dgv_hoadonbs.GetRowCellValue(dgv_hoadonbs.FocusedRowHandle, "nguoicap").ToString();
            hdbs.txt_motahd.Text    = dgv_hoadonbs.GetRowCellValue(dgv_hoadonbs.FocusedRowHandle, "mota").ToString();
            hdbs.dtp_ngaycap.Text   = dgv_hoadonbs.GetRowCellValue(dgv_hoadonbs.FocusedRowHandle, "ngaycap").ToString();

            hdbs.btn_them.Enabled      = false;
            hdbs.txt_mahienthi.Enabled = false;
        }