private void textBox1_TextChanged(object sender, EventArgs e)
        {
            int i = 0;

            if (int.TryParse(textBox1.Text, out i))
            {
                this.Cursor = Cursors.WaitCursor;
                datas data = datas.instance();
                datas._customer.id_customer = Convert.ToInt32(textBox1.Text);
                datas._Customer cst = data.seachCustomer();
                write_type_drink(cst.type_drink);
                write_qtSucre(cst.qtsucre);
                write_mug(cst.mug);
                this.Cursor = Cursors.Default;
            }
        }