nusoap 中文乱码 C# 调用

<?phprequire_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);            }        }