将数据从服务器发送回客户端

我有一个TcpClient应用程序，它将消息从客户端发送到服务器。以下代码：

clsServer.cs

public void server_start()
    {
        this.tcpListener = new TcpListener(new IPAddress(new Byte[] { 172, 16, 1, 55 }), 9999);
        this.listenThread = new Thread(new ThreadStart(ListenForClients));
        _rtb_Input.AppendText("Listening... Press any key to stop" + System.Environment.NewLine);
        this.listenThread.Start();
    }
    private void ListenForClients()
    {
        this.tcpListener.Start();
        while (true)
        {
            //blocks until a client has connected to the server
            client = this.tcpListener.AcceptTcpClient();
            //create a thread to handle communication
            //with connected client
            Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
            clientThread.Start(client);
        }
    }
    public event MessageReceivedHandler MessageReceived;
    private void HandleClientComm(object client)
    {
        TcpClient tcpClient = (TcpClient)client;
        NetworkStream clientStream = tcpClient.GetStream();
        byte[] message = new byte[4096];
        int bytesRead;
        while (true)
        {
            bytesRead = clientStream.Read(message, 0, 4096);
            //message has successfully been received
            ASCIIEncoding encoder = new ASCIIEncoding();
            string msg = encoder.GetString(message, 0, bytesRead);
            if (this.MessageReceived != null)
            {
                this.MessageReceived(msg);
            }
            //send message back select the message from the db
            byte[] buffer = encoder.GetBytes("Hello Client!");
            clientStream.Write(buffer, 0, buffer.Length);
            clientStream.Flush();
        }
        tcpClient.Close();
    }

frmClient.cs

public frmClient()
    {
        InitializeComponent();         
    }
    private void btn_ClientStart_Click(object sender, EventArgs e)
    {
        TcpClient client = new TcpClient();
        IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse("172.16.1.55"), 9999);
        try
        {
            client.Connect(serverEndPoint);
            NetworkStream clientStream = client.GetStream();
            ASCIIEncoding encoder = new ASCIIEncoding();
            byte[] buffer = encoder.GetBytes(rtb_Outpot.Text);
            clientStream.Write(buffer, 0, buffer.Length);
            clientStream.Flush();
        }
        catch (Exception ex)
        {
            rtb_Outpot.AppendText(System.Environment.NewLine + "Failed To Connect to the Server" + System.Environment.NewLine);
        }
    }

frmServer.cs

private void btn_ServerStart_Click(object sender, EventArgs e)
    {
        btn_ServerStop.Enabled = true;
        btn_ServerStart.Enabled = false;
        server = new clsServer(rtb_Input);
        server.MessageReceived += new MessageReceivedHandler(Message_Received);
        server.server_start();
    }
    private void Message_Received(string message)
    {
        //update the display using invoke
        Invoke(new MessageReceivedHandler(PrintToScreen), new object[] { message });
    }
    private void PrintToScreen(string msg)
    {
        msg_counter++;
        rtb_Input.AppendText("msg no': " + msg_counter + System.Environment.NewLine + msg + System.Environment.NewLine);
    }

当我从客户端向服务器发送消息时，工作正常。但现在我可以找到一种将数据从服务器发送回客户端的方法。我也必须为客户表单制作一个线程吗？

谢谢。