Capture Full XML in WebService

[WebMethod]
     public XmlDocument XML(XmlDocument xmlDoc)
     {
         XmlDocument x = new XmlDocument();
         x = xmlDoc;
         return xmlDoc;
     }

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <XML xmlns="http://tempuri.org/">
      <xmlDoc>string</xmlDoc>
      <number>96</number>
    </XML>
  </soap:Body>
</soap:Envelope>

POST http://localhost:50710/Service1.asmx?op=XML HTTP/1.1
POST /Service1.asmx HTTP/1.1: 
Host: localhost:50710
Content-Type: text/xml; charset=utf-8
Content-Length: 367
SOAPAction: "http://tempuri.org/XML"