using System;
using System.Xml;

public class Test
{
	public static void Main()
	{
		string xml1 = @"<s:Envelope xmlns:s='http://s...content-available-to-author-only...p.org/soap/envelope/' xmlns:u='http://d...content-available-to-author-only...n.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd'>
                            <s:Body>Body text!!!
                            </s:Body>
                            </s:Envelope>";
        string xml2 = @"<soapenv:Envelope xmlns:mes='MessageContracts' xmlns:req='RequestMessages' xmlns:soapenv='http://s...content-available-to-author-only...p.org/soap/envelope/'>
                          <soapenv:Body>Body text 2!!!
                          </soapenv:Body>
                        </soapenv:Envelope>";
        XmlNode body1 = GetBody(xml1), body2 = GetBody(xml2);
        
        Console.WriteLine(body1.InnerText);
        Console.WriteLine(body2.InnerText);
	}
    
    private static XmlNode GetBody(string xml)
    {
        XmlDocument doc = new XmlDocument();
        doc.LoadXml(xml);
        XmlNamespaceManager nsm = new XmlNamespaceManager(doc.NameTable);
        nsm.AddNamespace("soap", "http://s...content-available-to-author-only...p.org/soap/envelope/");
        XmlNode body = doc.SelectSingleNode("/soap:Envelope/soap:Body", nsm);
        
        return body;
    }
}