Most of network programming I do is Web/HTTP oriented. So it has been a while since I had to work with TCP and Socket programming directly. Yesterday I needed to write a quick TCP Server. C# and .NET made this really easy to do:

using System;
using System.Text;
using System.Net;
using System.Net.Sockets;

public class TCPServer
{
    private static int port = 8001;

    public static void Main()
    {
        IPAddress ipAddress = IPAddress.Any;
        TcpListener listener = new TcpListener(ipAddress, port);
        listener.Start();
        Console.WriteLine("Server is running");
        Console.WriteLine("Listening on port " + port);
        Console.WriteLine("Waiting for connections...");
        while (true)
        {
            Socket s = listener.AcceptSocket();
            Console.WriteLine("Connection accepted from " + s.RemoteEndPoint);
            byte[] b = new byte[65535];
            int k = s.Receive(b);
            Console.WriteLine("Received:");
            for (int i = 0; i < k; i++)
                Console.Write(Convert.ToChar(b[i]));
            ASCIIEncoding enc = new ASCIIEncoding();
            s.Send(enc.GetBytes("Server responded"));
            Console.WriteLine("\nSent Response");
            s.Close();
    }
}