flex datagrid .net

==============flex===========
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="Service.GetCustomers.send();" width="689" height="592">
 
    <mx:WebService id="Service"  wsdl="http://localhost:4702/flex/Service.asmx?WSDL" useProxy="false">
        <mx:operation name="GetCustomers">
         
        </mx:operation>
    </mx:WebService>
    <mx:DataGrid x="25" width="100%" y="10" dataProvider="{Service.GetCustomers.lastResult.Tables.customer.Rows}">
        <mx:columns>
            <mx:DataGridColumn headerText="ID" dataField="id"/>
            <mx:DataGridColumn headerText="标题" dataField="title"/>
            <mx:DataGridColumn headerText="内容" dataField="content"/>
            <mx:DataGridColumn headerText="时间" dataField="time"/>
            <mx:DataGridColumn headerText="类型" dataField="type"/>
        </mx:columns>
    </mx:DataGrid>
  
</mx:Application>
=========flex=======================
==========.net===================
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Data
Imports System.Data.SqlClient
'若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
' <System.Web.Script.Services.ScriptService()> _
<WebService(Namespace:="http://tempuri.org