public void loadControl()
{
DataTable dtHangHoa = new DataTable();
dtHangHoa = hbus.ShowHang();
dgvhang.DataSource = dtHangHoa;
DataTable dt1 = new DataTable();
dt1 = hbus.ShowHangloaihang();
cboMaLoai.DisplayMember = "MaLoai";
cboMaLoai.ValueMember = "TenLoai";
cboMaLoai.DataSource = dt1;
DataTable dt2 = new DataTable();
dt2 = hbus.ShowHangnhacungcap();
cboMaNCC.DisplayMember = "MaNCC";
cboMaNCC.ValueMember = "TenNCC";
cboMaNCC.DataSource = dt2;
}