private void BindCashier()
        {
            CashierBLL cb  = new CashierBLL();
            string     xml = cb.getCashiers();

            ArrayList cashiers = new ArrayList();

            try
            {
                XmlNodeList nodelists = XMLStrHelper.GetXmlNodeListByXpath(xml, "Alipay/item");
                int         selIndex  = 0;
                if (nodelists.Count > 0)
                {
                    for (int i = 0; i < nodelists.Count; i++)
                    {
                        string cashier_name = nodelists.Item(i).InnerText;
                        cashiers.Add(cashier_name);
                        if (cashier_name == StaticData.Cashier.cashier_name)
                        {
                            selIndex = i;
                        }
                    }

                    cmbUsername.DataSource    = cashiers;
                    cmbUsername.SelectedIndex = selIndex;
                }
                else
                {
                    lblMsg.Text    = "您还未添加收银员请到服务端添加";
                    lblMsg.Visible = true;
                }
            }
            catch (Exception ex)
            {
                lblMsg.Text    = "异常:" + ex.Message;
                lblMsg.Visible = true;
            }
        }