private void frmLapHoaDon_Load(object sender, EventArgs e)
{
foreach (string ele in nvBUL.LayTenNhanVien())
{
cmbTenNhanVien.Items.Add(ele);
}
if (sphdBUL.LayGioHang() != null)
{
dgvListSanPhamMua.DataSource = sphdBUL.LayGioHang();
txtThanhTien.Text = Convert.ToString(sphdBUL.ThanhTien());
}
}