SoapServerMessage Class

   // Process the SOAP message received and write it to a log file.
   public override void ProcessMessage(SoapMessage message) 
   {
      switch (message.Stage) 
      {
         case SoapMessageStage.BeforeSerialize:
            break;
         case SoapMessageStage.AfterSerialize:
            WriteOutput((SoapServerMessage)message);
            break;
         case SoapMessageStage.BeforeDeserialize:
            WriteInputBeforeDeserialize((SoapServerMessage)message);
            break;
         case SoapMessageStage.AfterDeserialize:
            WriteInputAfterDeserialize((SoapServerMessage)message);
            break;
         default:
            throw new Exception("invalid stage");
      }
   }

   // Write the contents of the incoming SOAP message to the log file.
   public void WriteInputAfterDeserialize(SoapServerMessage message)
   {
// <Snippet5>
      FileStream myFileStream = 
         new FileStream(filename, FileMode.Append, FileAccess.Write);
      StreamWriter myStreamWriter = new StreamWriter(myFileStream);

      // Print to the log file the request header field for SoapAction header.
      myStreamWriter.WriteLine("The SoapAction HTTP request header field is: ");
      myStreamWriter.WriteLine("\t" + message.Action);

      // Print to the log file the type of the XML Web service.
      myStreamWriter.WriteLine("The type of the XML Web service is: ");
      if((message.Server.GetType()).Equals(typeof(MathSvc)))
         myStreamWriter.WriteLine("\tMathSvc");

      // Print to the log file the name of the XML Web service method.
      myStreamWriter.WriteLine(
         "The method of the XML Web service method requested:");
      myStreamWriter.WriteLine("\t" + message.MethodInfo.Name);

      // Print to the log file if the method invoked is OneWay.
      if(message.OneWay)
         myStreamWriter.WriteLine(
            "The client doesn't wait for the server to finish processing");
      else
         myStreamWriter.WriteLine(
            "The client waits for the server to finish processing");

      // Print to the log file the URL of the site that provides 
      // implementation of the XML Web service method.
      myStreamWriter.WriteLine(
         "The URL of the requested XML Web service method: ");
      myStreamWriter.WriteLine("\t" + message.Url);
      myStreamWriter.Flush();
      myStreamWriter.Close();
      myFileStream.Close();
// </Snippet3>
   }