private void buttonThem_Click(object sender, EventArgs e)
        {
            buttonHuyBan.Enabled    = true;
            buttonKetThuc.Enabled   = true;
            buttontTachBan.Enabled  = true;
            buttonGopBan.Enabled    = true;
            buttonChuyenBan.Enabled = true;

            TableCoffee tableCoffee = listView1.Tag as TableCoffee;
            int         idBill      = BillDAO.Instance.getIdBillByIdTable(tableCoffee.Id);

            int idFood    = (comboBoxFood.SelectedItem as Food).Id;
            int countFood = (int)numericUpDown1.Value;

            if (idBill == -1)
            {
                getDateCheckIn_ver2();
                BillDAO.Instance.insertBill(tableCoffee.Id);
                InforBillDAO.Instance.insertInforBill(BillDAO.Instance.getMaxIdBill(), idFood, countFood);
            }
            else
            {
                InforBillDAO.Instance.insertInforBill(idBill, idFood, countFood);
            }


            showDanhSachMon(tableCoffee.Id);
            loadTableCoffee();
            textBoxCheckOut.Clear();
        }
        private void button7_Click(object sender, EventArgs e)
        {
            TableCoffee tableCoffee    = listView1.Tag as TableCoffee;
            int         idBill         = BillDAO.Instance.getIdBillByIdTable(tableCoffee.Id);
            int         discountCoffee = (int)numericUpDown2.Value;

            double totalPrice      = Convert.ToDouble(textBoxTongTien.Text.Split(',')[0].Replace(".", ""));
            double finalTotalPrice = totalPrice - ((totalPrice / 100) * discountCoffee);

            if (idBill != -1)
            {
                if (MessageBox.Show("Bạn có chắc muốn thanh toán cho " + tableCoffee.NameTable + "\nTổng tiền = " + finalTotalPrice + " VNĐ", "Thông Báo", MessageBoxButtons.OKCancel) == System.Windows.Forms.DialogResult.OK)
                {
                    textBox9.Clear();
                    buttonThem.Enabled      = false;
                    buttonGiam.Enabled      = false;
                    buttonXoa.Enabled       = false;
                    buttonXuatBill.Enabled  = false;
                    buttonBatDau.Enabled    = false;
                    buttonHuyBan.Enabled    = false;
                    buttonKetThuc.Enabled   = false;
                    buttontTachBan.Enabled  = false;
                    buttonGopBan.Enabled    = false;
                    buttonChuyenBan.Enabled = false;
                    button7.Enabled         = false;
                    CultureInfo cultureInfo = new CultureInfo("vi-VN");
                    label17.Text = finalTotalPrice.ToString("c", cultureInfo);
                    BillDAO.Instance.checkOut(idBill, discountCoffee, (float)finalTotalPrice);
                    //showDanhSachMon1(tableCoffee.Id);
                    loadTableCoffee();
                    getDateCheckOut_ver2();
                }
            }
        }
        private void buttonGiam_Click(object sender, EventArgs e)
        {
            TableCoffee table  = listView1.Tag as TableCoffee;
            int         idBill = BillDAO.Instance.getIdBillByIdTable(table.Id);

            int idFood = (comboBoxFood.SelectedItem as Food).Id;

            int countFood = (int)numericUpDown1.Value;

            if (idBill == -1)
            {
                buttonGiam.Enabled = true;
            }
            else
            {
                InforBillDAO.Instance.insertInforBillVer2(idBill, idFood, countFood);
                showDanhSachMon(table.Id);
                loadTableCoffee();
                textBoxCheckOut.Clear();
            }
        }