pony

  public class Server
  {
    public async void Run(int port)
    {
      TcpListener server = null;

      try
      {
        IPAddress localAddr = IPAddress.Parse("127.0.0.1");
        server = new TcpListener(localAddr, port);

        // Start listening for client requests.
        server.Start();

        // Buffer for reading data
        var bytes = new Byte[256];

        // Enter the listening loop.
        while (true)
        {
          RaiseLog("Waiting for a connection... ");

          // Perform a blocking call to accept requests.
          // You could also user server.AcceptSocket() here.
          TcpClient client = await server.AcceptTcpClientAsync();
          RaiseLog("Connected!");

          // Get a stream object for reading and writing
          NetworkStream stream = client.GetStream();

          int i;

          // Loop to receive all the data sent by the client.
          while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
          {
            // Translate data bytes to a UTF8 string.
            string data = Encoding.UTF8.GetString(bytes, 0, i);
            RaiseLog("Received: {0}", data);

            // Process the data sent by the client.
            data = data.ToUpper();

            byte[] msg = Encoding.UTF8.GetBytes(data);

            // Send back a response.
            stream.Write(msg, 0, msg.Length);
            RaiseLog("Sent: {0}", data);
          }

          // Shutdown and end connection
          client.Close();
        }
      }
      catch (SocketException e)
      {
        RaiseLog("SocketException: {0}", e);
      }
      finally
      {
        // Stop listening for new clients.
        if (server != null)
        {
          server.Stop();
        }
      }
    }

    private void RaiseLog(string format, params object[] args)
    {
      var tmp = Log;
      if (tmp != null)
      {
        string s = string.Format(format, args);
        tmp(this, s);
      }
    }

    public event EventHandler<string> Log;
  }

    private static void Main()
    {
      var server = new Server();
      server.Log += (s, e) => Console.WriteLine(e);

      server.Run(port: 145);
...
   }