This is a subset of my Web Service class which intercepts the SOAP message and stores it into the HTTPContext so I can access it from my application.

        Public Overrides Sub ProcessMessage(ByVal message As SoapMessage)
            Dim loStreamReader As StreamReader = Nothing
            Dim lcString As String = ""

            Select Case message.Stage

                Case SoapMessageStage.BeforeSerialize

                Case SoapMessageStage.AfterSerialize
                    WriteOutput(message)

                Case SoapMessageStage.BeforeDeserialize
                    WriteInput(message)

                    ' Retrieve the SOAP Message from the Input Stream
                    ' Save the SOAP Message in Request-scope State Bag

                    System.Web.HttpContext.Current.Request.InputStream.Position = 0

                    loStreamReader = New StreamReader(System.Web.HttpContext.Current.Request.InputStream)
                    lcString = loStreamReader.ReadToEnd()

                    System.Web.HttpContext.Current.Items("HTTPInputStream") = lcString

                Case SoapMessageStage.AfterDeserialize

            End Select

        End Sub

So, basically, later on in the application, I can know what was received in the SOAP envelope. Now, we need to do the same thing for the response. This is the difficult part. Has anyone done that before? Basically, I need to know what was sent to the client.