catch (FaultException faultException)
            {
                var fault = faultException.CreateMessageFault();
                rc = false;
                var doc = new XmlDocument();
                var nav = doc.CreateNavigator();
                if (nav != null)
                {
                    using (var writer = nav.AppendChild())
                    {
                        fault.WriteTo(writer, EnvelopeVersion.Soap11);

                    }

                    //this is where you implement your API specific code 
                    //to handle the returned detail.
                    string s = doc.InnerXml; //do something with it
                    this.rtbMessage.Text = s;
                }
            }