Miscellany

using System;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

/*
 *  This program establishes a connection to irc server, joins a channel and greets every nickname that
 *  joins the channel.
 *
 *  Coded by Pasi Havia 17.11.2001 http://koti.mbnet.fi/~curupted
 */
class IrcBot
{
    // Irc server to connect 
    public static string SERVER = "irc.adichat.dk";

    // Irc server's port (6667 is default port)
    private static int PORT = 6667;

    // User information defined in RFC 2812 (Internet Relay Chat: Client Protocol) is sent to irc server	
    //private static string USER = "USER JanCBot 8 * :I'm a C# irc bot";

    // Bot's nickname
    private static string NICK = "JanCBot";

    // Channel to join
    private static string CHANNEL = "#my_channel";

    // StreamWriter is declared here so that PingSender can access it
    public static StreamWriter writer;

    public static void ReadCommands()
    {
        while (true)
        {
            writer.WriteLine(Console.ReadLine());
            writer.Flush();
        }
    }
    static void Main(string[] args)
    {
        NetworkStream stream;
        TcpClient irc;
        string inputLine;
        StreamReader reader;
        string nickname;

        try
        {
            irc = new TcpClient(SERVER, PORT);
            stream = irc.GetStream();
            reader = new StreamReader(stream);
            writer = new StreamWriter(stream);

            // Start PingSender thread
            PingSender ping = new PingSender();
            //ping.Start();
            new Thread(new ThreadStart(ReadCommands)).Start();
            writer.WriteLine("USER jan 0 * :Jan");
            writer.Flush();
            writer.WriteLine("NICK " + NICK);
            writer.Flush();
            writer.WriteLine("JOIN " + CHANNEL);
            writer.Flush();
            while (true)
            {
                while ((inputLine = reader.ReadLine()) != null)
                {

                    if (inputLine.EndsWith("JOIN :" + CHANNEL))
                    {
                        // Parse nickname of person who joined the channel
                        nickname = inputLine.Substring(1, inputLine.IndexOf("!") - 1);

                        // Welcome the nickname to channel by sending a notice
                        writer.WriteLine("NOTICE " + nickname + " :Hi " + nickname +
                        " and welcome to " + CHANNEL + " channel!");
                        writer.Flush();

                        // Sleep to prevent excess flood
                        Thread.Sleep(2000);
                    }
                    else
                    {
                        Console.Write(inputLine + "\n");
                    }
                }

                // Close all streams
                writer.Close();
                reader.Close();
                irc.Close();
            }
        }
        catch (Exception e)
        {
            // Show the exception, sleep for a while and try to establish a new connection to irc server
            Console.WriteLine(e.ToString());
            Thread.Sleep(5000);
            string[] argv = { };
            Main(argv);
        }
    }
}