class ClientClass : ClientInterface
    {
        public void OnCallback(object aUpdatedObject)
        {
            try
            {
                Form1.addTextOnInstance(aUpdatedObject.ToString());
            }
            catch (Exception ex)
            {
                Form1.addTextOnInstance(ex.ToString());
            }
        }
    }

/*************************************************
 * I do this in my application upon startup
*/
private void Form1_Load(object sender, EventArgs e)
        {
            NetNamedPipeBinding tBinding = new NetNamedPipeBinding();
            tBinding.MaxReceivedMessageSize = 2000000;


            ClientClass tClientClass = new ClientClass();
            DuplexChannelFactory<RequestInterface> pipeFactory =
             new DuplexChannelFactory<RequestInterface>(
                tClientClass,
                tBinding,
                new EndpointAddress(
                   "net.pipe://localhost/Request"));

            try
            {
                RequestInterface tInterface = pipeFactory.CreateChannel();

                tInterface.Subscribe();
                addText("completed successfully");
            }
            catch (Exception aEx)
            {
                addText(aEx.Message);
                addText(aEx.ToString());
            }
        }