//Hàng hóa
        void LoadDsHangHoa()
        {
            HangHoaBUS hangBUS = new HangHoaBUS();

            dtgvHangHoa.AutoGenerateColumns = false;
            dtgvHangHoa.DataSource          = hangBUS.LoadDsHH();
        }
        void LoadComboboxTenHH()
        {
            HangHoaBUS hhBUS = new HangHoaBUS();

            cboTenHangHoa.DataSource    = hhBUS.LoadDsHH();
            cboTenHangHoa.DisplayMember = "Tenhh";
            cboTenHangHoa.ValueMember   = "Mahh";
        }