Simple NDde demo for reading and writing data to Excel using DDE

Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using NDde.Client;

// Adapted from: http://ndde.codeplex.com/discussions/399046

static class Program
{
    static void Main(IEnumerable<string> args, TextReader stdin, TextWriter stdout, TextWriter stderr)
    {
        var argq = new Queue<string>(args.Where(arg => !string.IsNullOrEmpty(arg)));
        var topic      = argq.Count > 0 ? argq.Dequeue() : "Book1";
        var inputItem  = argq.Count > 0 ? argq.Dequeue() : "R1C1";
        var outputItem = argq.Count > 0 ? argq.Dequeue() : "R1C2";
        
        using (var client = new DdeClient("EXCEL", topic))
        {
            client.Connect();
            stderr.WriteLine("Connected.");
            client.StartAdvise(inputItem, 1, true, TimeSpan.FromMinutes(1));
            client.Disconnected += (_, e) => { if (e.IsServerInitiated) { stderr.WriteLine("Server disconnected."); } };
            client.Advise += (_, e) => stdout.WriteLine(e.Text.TrimEnd('\r', '\n', '\0'));

            string line;
            while ((line = stdin.ReadLine()) != null)
            {
                if (client.IsConnected)
                    client.Poke(outputItem, line + "\0", TimeSpan.FromSeconds(4));
                else
                    stderr.WriteLine("WARNING! Client no longer appears connected.");
            }
        }
    }

    static int Main(string[] args)
    {
        try
        {
            Main(args, Console.In, Console.Out, Console.Error);
            return 0;
        }
        catch (Exception e)
        {
            Console.Error.WriteLine(e.GetBaseException().Message);
            return 1;
        }
    }
}

static class DdeClientExtensions
{
    public static void StartAdvise(this DdeClient client, string item, int format, bool hot, TimeSpan timeout)
    {
        if (client == null) throw new ArgumentNullException("client");
        client.StartAdvise(item, format, hot, (int) timeout.TotalMilliseconds);
    }

    public static void Poke(this DdeClient client, string item, string data, TimeSpan timeout)
    {
        if (client == null) throw new ArgumentNullException("client");
        client.Poke(item, data, (int) timeout.TotalMilliseconds);
    }
}

Hi, thank you for your great example. Our team is migrating VB app to window form application and using DDE to communicate between processes. Do you know how to using NDDE to make a communication between 2 window form app with specified control?