private void BindPOS()
{
DataTable storeHiPOSChild = StoresHelper.GetStoreHiPOSChild(this.systemStoreId);
DataRow dataRow = storeHiPOSChild.NewRow();
dataRow["Alias"] = "请选择pos机";
dataRow["HiPOSDeviceId"] = "0";
storeHiPOSChild.Rows.InsertAt(dataRow, 0);
this.ddlPOS.DataTextField = "Alias";
this.ddlPOS.DataValueField = "HiPOSDeviceId";
this.ddlPOS.DataSource = storeHiPOSChild;
this.ddlPOS.DataBind();
this.ddlPOS.SelectedValue = this.deviceId;
}