Convert XLANGMessage to string

This method has come in handy so much more than I ever thought it would. It's sole purpose is to take a BizTalk message and convert it to a string. One example of where I use it is when I am logging information from within an orchestration.

I suppose you could add an index parameter if you wanted to use this with multi-part messages.

public static class Utilities {
        /// <summary>
        /// Converts the contents of a message to a string.  Careful with large messages, 
        /// as it will try to put the entire message into the string variable.  
        /// Not intended for multi-part messages, unless the body part is the first part
        /// </summary>
        /// <param name="msg">The BizTalk XLANGMessage</param>
        public static string ConvertMsgToString(XLANGMessage msg)
        {
            lock (xmlDoc)
            {
                xmlDoc = (XmlDocument)msg[0].RetrieveAs(typeof(XmlDocument));
                return xmlDoc.DocumentElement.OuterXml;
            }
        }
}

This usage is from an Expression shape in the Orchestration designer:

System.Diagnostics.EventLog.WriteEntry(
  "Entry Title"
  , Utilities.ConvertMsgToString(
    <MessageVariableHere>
  )
);