my IRC bot

using System;

namespace ircclient
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int port;
            string buf, nick, owner, server, chan;
            System.Net.Sockets.TcpClient sock = new System.Net.Sockets.TcpClient();
            System.IO.TextReader input;
            System.IO.TextWriter output;

            //Get nick, owner, server, port, and channel from user
            Console.Write("Enter bot nick: ");
            nick = Console.ReadLine();
            Console.Write("Enter bot owner name: ");
            owner = Console.ReadLine();
            Console.Write("Enter server name: ");
            server = Console.ReadLine();
            Console.Write("Enter port number: ");
            port = Convert.ToInt32(Console.ReadLine());
            Console.Write("Channel: ");
            chan = Console.ReadLine();

            //Connect to irc server and get input and output text streams from TcpClient.
            sock.Connect(server, port);
            if (!sock.Connected)
            {
                Console.WriteLine("Failed to connect!");
                return;
            }
            input = new System.IO.StreamReader(sock.GetStream());
            output = new System.IO.StreamWriter(sock.GetStream());

            //Starting USER and NICK login commands
            output.Write(
                "USER " + nick + " 0 * :" + owner + "\r\n" +
                "NICK " + nick + "\r\n"
            );
            output.Flush();

            //Process each line received from irc server
            for (buf = input.ReadLine(); ; buf = input.ReadLine())
            {

                //Display received irc message
                Console.WriteLine(buf);

                //Send pong reply to any ping messages
                if (buf.StartsWith("PING ")) { output.Write(buf.Replace("PING", "PONG") + "\r\n"); output.Flush(); }
                if (buf[0] != ':') continue;

                /* IRC commands come in one of these formats:
                 * :NICK!USER@HOST COMMAND ARGS ... :DATA\r\n
                 * :SERVER COMAND ARGS ... :DATA\r\n
                 */

                //After server sends 001 command, we can set mode to bot and join a channel
                if (buf.Split(' ')[1] == "001")
                {
                    output.Write(
                        "MODE " + nick + " +B\r\n" +
                        "JOIN " + chan + "\r\n"
                    );
                    output.Flush();
                }
            }
        }
    }
}