Something

public static string SERVER = "irc.freenode.net";
        private static int PORT = 6667;
        private static string USER = "USER guest 0 * :A Guest";
        private static string NICK = "botbotbot";
        private static string CHANNEL = "#my_chan";
        public static StreamWriter writer;
        public static StreamReader reader;
        public static TcpClient irc;

        public static void Main(string[] args)
        {
            NetworkStream stream;
            string inputLine;
            string nickname;
            try
            {
                irc = new TcpClient(SERVER, PORT);
                stream = irc.GetStream();
                reader = new StreamReader(stream);
                writer = new StreamWriter(stream);
                // Start PingSender thread
                writer.WriteLine(USER);
                writer.Flush();
                writer.WriteLine("/NICK " + NICK);
                writer.Flush();
               // writer.WriteLine("/JOIN " + CHANNEL);
               // writer.Flush();
                    while ((inputLine = reader.ReadLine()) != null)
                    {
                        Console.WriteLine(inputLine);
                    }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
            finally
            {
                writer.Close();
                reader.Close();
                irc.Close();
                Console.ReadLine();
            }
        }