<p>Visual Studio makes calling a web service easy, trying to figure out what is going on under the covers is difficult.</p>

<p>How can I see the actual XML generated from my .Net app when making a call to a web service?</p>

tools like
tcptrace
or
Fiddler
can help.
few troubleshooting links:
Tracing WCF with TcpTrace
Using Fiddler and Excel 07 to debug web services
Fiddler Can Make Debugging Easy