nusoap 中文乱码 C# 调用

<?php

require_once('../lib/nusoap.php');

$server = new soap_server();

$server->soap_defencoding='UTF-8';

$server->decode_utf8=false;

$server->configureWSDL('Service1');

$server->register('Welcome',array('name' => 'xsd:string'),array('return' => 'xsd:string'));

function Welcome($name) 

{

	return iconv("GBK","UTF-8",'你好').$name;

}

$HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';

$server->service($HTTP_RAW_POST_DATA);

?>
 
        private void button1_Click(object sender, EventArgs e)

        {

            try

            {

                AA.Service1 a = new WindowsFormsApplication1.AA.Service1();

                MessageBox.Show(a.Welcome("测试"));



            }

            catch (Exception Err)

            {

                MessageBox.Show(Err.Message);

            }

        }