I have been asked this question many times and thought I just put a quick note here.
If you want to access the message from a WCF service operations then you need to distinguish two cases.
public string Hello(string hello)
public void Process(Message message)
But calling ToString() on the message itself will only print <stream>…</stream> if it is a streamed message.
In these cases you may need to do something similar like the following snippet in order to print the body of the streamed message.
XmlTextWriter xtw= new XmlTextWriter(Console.Out);
xtw.Formatting = Formatting.Indented;