//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";
}