c# .net 调用php 的webservice接口

<?php
require_once('lib/nusoap.php');
function Add($a,$b)
 {
       return $a+$b;
 }
$soap = new soap_server;
$soap->configureWSDL('EventWSDL', 'http://tempuri.org/');
 $soap->register('Add',  array("a"=>"xsd:string","b"=>"xsd:string"),
 array("return"=>"xsd:string")
 );$HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
 $soap->service($HTTP_RAW_POST_DATA);
?>
 
在VS2010中添加Web引用：​​http://localhost:8181/test/nusoap/syc.php​​