<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
      <s:Header>
         <Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://tempuri.org/IService1/DoWork</Action>
      </s:Header>
      <s:Body>
        <DoWork xmlns="http://tempuri.org/" />
      </s:Body>
    </s:Envelope>

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
      <s:Body>
        <DoWork xmlns="http://tempuri.org/" />
      </s:Body>
    </s:Envelope>