ResponseMessage.cs

using System;
using System.IO;
using System.ServiceModel.Channels;

namespace RoyalMail
{
    public class ResponseMessage: LogMessage
    {
        private Guid guid;

        public ResponseMessage(Guid guid)
        {
            fileName = string.Format("{0}RoyalMailLog_{1:000}_{2}_Incoming.txt",
                        Properties.Settings.Default.RoyalMailLog, GetDateStamp(), guid);

            this.guid = guid;
        }

        protected override void CreateMessage(Message message, StreamWriter sw)
        {
            sw.WriteLine("Response to request to {0}:", guid);

            HttpResponseMessageProperty httpResp =
                (HttpResponseMessageProperty)message.Properties[HttpResponseMessageProperty.Name];

            sw.WriteLine("{0} {1}", (int)httpResp.StatusCode, httpResp.StatusCode);
        }
    }
}