网络点对点聊天基于P2P技术怎么整？

Question

TCP:开启监听Thread thListen = new Thread(new ThreadStart(Listen));
            thListen.Start();
如有收到消息，则进行相应处理：
private void Listen()
        {
            while (appRun)
            {
                try
                {
                    TcpListener tcpLi = new TcpListener(IPAddress.Any,2009);
                    tcpLi.Start();
                    TcpClient tcpCli = tcpLi.AcceptTcpClient();
                    NetworkStream ns = tcpCli.GetStream();                    byte[] buf = new byte[100000];
                    ns.Read(buf, 0, buf.Length);                    string[] msg = Encoding.Default.GetString(buf).Split('|');
                    //此处可以根据接收到的msg进行相应处理
               }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString());
                    return;
                }
         }
 }消息发送部分:
private void SendServceLogin(string msg)
        {
            try
            {
                TcpClient tcClie = new TcpClient();
                tcClie.Connect(IPAddress.Parse(txtIP.Text), 2009);                     NetworkStream ns = tcClie.GetStream();
                byte[] SendB = Encoding.Default.GetBytes(msg);                ns.Write(SendB, 0, SendB.Length);
                tcClie.Close();
            }
            catch (Exception e1)
            {
                MessageBox.Show(e1.ToString(), "提示", MessageBoxButtons.OK);
            }
        }
希望看到大神的回复