How to convert proxyclass to xml right away

Hi I'm doing a webservice project.

and I need to convert proxyclass, which comes as a result from the webservice according to WSDL, to XML.

Actually the response is made as a XML file in the firstplace. and when it comes to client, it converts to Proxyclass.

so is there any API for converting proxyclass to xml?

also I want to know if t开发者_如何学编程here's a way that client can get a XML file which is made from the server in the firstplace before it converts to proxyclass.