dropdownlist xml

<?xml version="1.0" encoding="utf-8" ?>
<Country Name="中国">
  <Province Name="全国">
    <City CityName="全国" PostalCode="2"></City>
  </Province>
  
  <Province Name="北京">
    <City CityName="北京" PostalCode="2"></City>
  </Province>

  <Province Name="重庆">
    <City CityName="重庆" PostalCode="2"></City>
  </Province>
</Country>



  <asp:DropDownList ID="ddl_city" runat="server" Height="30px" Width="70px" DataSourceID="XmlDataSource_City" DataTextField="CityName" DataValueField="PostalCode"></asp:DropDownList>
  



<asp:XmlDataSource ID="XmlDataSource_City" runat="server" DataFile="~/App_Data/XMLFile_City.xml"  XPath="/Country/Province/City"></asp:XmlDataSource>