private void BtHistory_Click(object sender, EventArgs e)
        {
            if (isHistory == false)
            {
                FHistory     f  = new FHistory(UKEY, Position, 1);
                DialogResult re = f.ShowDialog();
                if (re == DialogResult.OK)  //Xem chi tiết
                {
                    hoaDon = f.getOrder();
                    if (hoaDon.ListCTHD != null)
                    {
                        var CTHDList = new BindingList <CTHD>(hoaDon.ListCTHD); // <-- BindingList
                        dGVOrders.DataSource = CTHDList;
                        dGVOrders.Columns["NGNHAP"].Visible = false;
                        labelMaDon.Text = Convert.ToString(hoaDon.MaHD);

                        tBDoiTac.ForeColor = Color.Black;
                        tBDoiTac.Text      = hoaDon.TenDoiTac;
                        tBDoiTac.ReadOnly  = true;

                        tBLienHe.ForeColor = Color.Black;
                        tBLienHe.Text      = hoaDon.LienHe;
                        tBLienHe.ReadOnly  = true;

                        dTPTime.Value   = hoaDon.ThoiGian;
                        dTPTime.Enabled = false;

                        labelThanhTien.Text = hoaDon.GiaTri;
                        isHistory           = true;
                        isSaved             = false;
                        BtHistory.IconChar  = FontAwesome.Sharp.IconChar.ArrowCircleLeft;
                        BtHistory.Text      = "Quay lại";
                        setAccessButton(true, false, false, false, false, true);
                        BtHistory.Click += new EventHandler(BtCreateOrder_Click);
                    }
                    else
                    {
                        hoaDon.ListCTHD = new List <CTHD>();
                        hoaDon.ThoiGian = DateTime.Now.Date;
                    }
                }
                this.Show();
            }
            else
            {
                BtHistory.IconChar = FontAwesome.Sharp.IconChar.History;
                BtHistory.Text     = "Lịch sử";
                isHistory          = false;
                hoaDon.ThoiGian    = DateTime.Now.Date;
                BtHistory.Click   -= new EventHandler(BtCreateOrder_Click);
            }
        }
        void History_dGV()
        {
            FHistory f = new FHistory(UKey, Position, 0);

            f.ShowDialog();
            Stock stockDef = f.getStockDefine();

            if (stockDef != null)
            {
                dGVStock.DataSource = controller.Load_Search("Mã Hàng", stockDef.MAHANG, stockDef.UKEY1);  //Load các hàng hóa có mã trùng nhau
            }

            this.Show();
        }