multi threading issue in C# client/server chat application

Question

I have a TCP server/client chat program using C#.The server that receives messages from the customer and re-sent to the target.

When client connects to the server the server creates a new Thread for him.

My problem is that the server is to receive only one message from the customer does not receive any new message from him.

When I do debugging I noticed that the server receives the message and hang in the client Thread but not run again.

The server code:

namespace server
{
public partial class Form1 : Form
{
    private ArrayList alSockets;
    private delegate void UpdateLogCallback(string strMessage);


    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

        IPHostEntry IPHost = Dns.GetHostByName(Dns.GetHostName());
        textBox1.Text = "my ip is " + IPHost.AddressList[0].ToString();
        alSockets = new ArrayList();
        Thread thdListener = new Thread(new ThreadStart(listenerThread));
        thdListener.Name = "thdListener";

        thdListener.Start();

    }
    public void listenerThread()
    {
        TcpListener tcpc = new TcpListener(IPAddress.Any,6666);
        tcpc.Start();

        while (true)
        {
            Socket HndSoc = tcpc.AcceptSocket();
            if (HndSoc.Connected)
            {
                string str2 = "\n" + HndSoc.RemoteEndPoint.ToString() + " connected";
                this.Invoke(new UpdateLogCallback(this.update2),new object[] {str2});

                lock (this)
                {
                    alSockets.Add(HndSoc);

                }
                ThreadStart thdstHandler = new ThreadStart(handlerThread);
                Thread thdHandler = new Thread(thdstHandler);
                thdHandler.Name = "thdHandler";
                thdHandler.Start();

             }
            else if(!HndSoc.Connected)
            {
                string str2 = "\n" + HndSoc.RemoteEndPoint.ToString() + " desconnected";
                this.Invoke(new UpdateLogCallback(this.update2), new object[] { str2 });

            }

            }
        }
    public void handlerThread()
    {
        byte [] rx = new byte [1024];
        Socket hanso = (Socket) alSockets[alSockets.Count-1];
       NetworkStream ns = new NetworkStream(hanso);
       // NetworkStream  ns = hanso. 
        ns.Read(rx,0,rx.Length);
   //     textBox1.Text = "\n";
     //   textBox1.Text =  Encoding.ASCII.GetString(rx);
        string str = Encoding.ASCII.GetString(rx);
       // update(str);
        this.Invoke(new UpdateLogCallback(this.update), new object[] { str });
       // ns.Close();
       // hanso = null;
        rx = new byte[1024];
        ns.Read(rx, 0, rx.Length);

    }

And this is client code if needed:

namespace simple_clint
{
public partial class Form1 : Form
{
    byte[] tx = new byte[1024];
  //  IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("127.0.0.1"),6666);

    TcpClient tcp1 = new TcpClient("127.0.0.1", 6666);


    public Form1()
    {
        InitializeComponent();
    }

    private void send_Click(object sender, EventArgs e)
    {
        tx = Encoding.ASCII.GetBytes(textBox1.Text);
        try
        {
            NetworkStream ns = tcp1.GetStream();
            ns.Write(tx, 0, tx.Length);
          //  ns.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

    }

    private void Form1_Load(object sender, EventArgs e)
    {
        try
        {

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
}
}

Answer 1

Thanks to kajacx. I need to add loop into handlerThread() the new code:

public void handlerThread()
    {

            byte[] rx = new byte[1024];
            Socket hanso = (Socket)alSockets[alSockets.Count - 1];
            while (true)
            {
            NetworkStream ns = new NetworkStream(hanso);
            ns.Read(rx, 0, rx.Length);
            string str = Encoding.ASCII.GetString(rx);
            this.Invoke(new UpdateLogCallback(this.update), new object[] { str });

        }

    }

and I remove last two lines