c# webservice return XmlElement

Question

Hi

I have problem with return XmlElement, who has value only firstchild of soap response.

Soap Response looks like this:

ResponseCode: 200 (OK)
Content-Length:537
Cache-Control:private, max-age=0
Content-Type:text/xml; charset=utf-8
Date:Tue, 18 May 2010 10:13:57 GMT
Server:Microsoft-IIS/6.0
X-AspNet-Version:1.1.4322
X-Powered-By:ASP.NET

<?xml version="1.0" encoding="utf-16"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt;
  <soap:Body>
    <p_loginResponse xmlns="http://www.dhimahi.com/"&gt;
      <p_loginResult>
        <partner_name>Tripdrop</partner_name>
        <address />
        <tel />
        <session_id>e16e3bcb-3aea-4be9-ba51-779f4e109fa8</session_id>
        <fax />
        <web />
        <pid>2694</pid>
        <city />
        <country>PL</country>
        <postal />
        <email />
      </p_loginResult>
    </p_loginResponse>
  </soap:Body>
</soap:Envelope>

I call webservice like this:

Client = new CronEventim.eventim.p_client();
XmlElement _response = Client.p_login(_partnerID, _username, _password);

And XmlElement looks like this (i get by call _response.OuterXml):

<partner_name xmlns="http://www.dhimahi.com/"&gt;Tripdrop&lt;/partner_name&gt;

How can I get value of session_id node??