Guess My Drawing!

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


class Program
{
    static void Main(string[] args)
    {
        ArrayList Clients = new ArrayList();
        ArrayList drawing = new ArrayList();
        IPEndPoint localEP = new IPEndPoint(IPAddress.Any, 9050);
        UdpClient server = new UdpClient(localEP);
        IPEndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
        string theAnswer = "";
        byte[] data;
        string msg;

        while (true)
        {
            data = server.Receive(ref remoteEP);
            Console.Write("Received from {0}: ", remoteEP.ToString());

            msg = Encoding.ASCII.GetString(data, 0, data.Length);
            Console.WriteLine(msg);

          
            if (msg.StartsWith("join"))
            {

                if (msg.EndsWith("drawer"))
                {
                    if (Clients.Count == 0)
                        addDrawer(Clients, localEP, server, remoteEP);
                    else
                    {
                        msg = "denied";
                        data = Encoding.ASCII.GetBytes(msg);
                        server.Send(data, data.Length, remoteEP);
                    }
                }

                if (msg.EndsWith("guesser"))
                {
                    if (Clients.Count == 0)
                    {
                        msg = "denied";
                        data = Encoding.ASCII.GetBytes(msg);
                        server.Send(data, data.Length, remoteEP);
                    }
                    else
                    {
                        addGuesser(Clients, localEP, server, remoteEP);
                    }
                }
            }

            if (msg.StartsWith("quit"))
            {
                if (msg.EndsWith("drawer"))
                    foreach (IPEndPoint endpoint in Clients)
                        {
                          data = Encoding.ASCII.GetBytes(msg);
                          server.Send(data, data.Length, remoteEP);
                          }
                Clients.Remove(remoteEP);
            }

            if (msg.StartsWith("draw"))
            {
                foreach (IPEndPoint endpoint in Clients)
                {
                    data = Encoding.ASCII.GetBytes(msg);
                    server.Send(data, data.Length, endpoint);
                }
            }

            if (msg.StartsWith("gues"))
            {
                if (msg.EndsWith(theAnswer))
                    msg += "true";
                else
                    msg += "false";
                foreach (IPEndPoint endpoint in Clients)
                {
                    data = Encoding.ASCII.GetBytes(msg);
                    server.Send(data, data.Length, endpoint);
                }
            }

            if (msg.StartsWith("submit"))
            {
                theAnswer = msg.Substring(7).ToLower();
            }

        }
    }

    public static void addDrawer(ArrayList Clients, IPEndPoint localEP, UdpClient server, IPEndPoint remoteEP)
    {
        Clients.Add(remoteEP);
        string msg = "accept";
        byte[] data = Encoding.ASCII.GetBytes(msg);
        server.Send(data, data.Length, remoteEP);
    }

    public static void addGuesser(ArrayList Clients, IPEndPoint localEP, UdpClient server, IPEndPoint remoteEP)
    {
        Clients.Add(remoteEP);
        string msg = "accept";
        byte[] data = Encoding.ASCII.GetBytes(msg);
        server.Send(data, data.Length, remoteEP);
    }
}