private void btnXoaItemCTHD_Click(object sender, EventArgs e)
{
btnXoaItemCTHD.Enabled = false;
bllBanHang.DeleteChiTietHoaDon(maCTHD);
bllBanHang.UpdateCongSoLuongNguyenLieu(maDoUong, soLuongMua);
UpdateTongTienForHoaDon(lblMaHoaDon.Text);
lblTongTien.Text = GetTongTien(lblMaHoaDon.Text);
LoadChiTietHoaDon(lblMaHoaDon.Text);
if (grvChiTietHoaDon.FocusedRowHandle < 0)
{
btnDongBan.Visible = true;
}
}