Chat Client using TCP Sockets

This is just a simple chat client to work with the Chat server discussed in earlier post. it is a winform application that contains two textboxes one for message input and other for historical broadcast messages.


 public partial class Form1 : Form
    {
        StringBuilder history;
        TcpClient client = new TcpClient();
        NetworkStream clientStream;

        public Form1()
        {
            InitializeComponent();
            this.Load += new EventHandler(Form1_Load);
        }

        void Form1_Load(object sender, EventArgs e)
        {
            IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 3000);
            history = new StringBuilder();
            try
            {
                client.Connect(serverEndPoint);
                clientStream = client.GetStream();
                lblStatus.Text = "Connected to Server";
                Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
                clientThread.Start(client);
            }
            catch { lblStatus.Text = "Unable to Connect to Server"; }
        }


        private void HandleClientComm(object client)
        {
            TcpClient tcpClient = (TcpClient)client;
            NetworkStream clientStream = tcpClient.GetStream();

            byte[] message = new byte[4096];
            int bytesRead;

            while (true)
            {
                bytesRead = 0;

                try
                {
                    //blocks until a client sends a message
                    bytesRead = clientStream.Read(message, 0, 4096);

                }
                catch
                {
                    //a socket error has occured
                    break;
                }

                if (bytesRead == 0)
                {
                    //the client has disconnected from the server
                    break;
                }

                //message has successfully been received
                ASCIIEncoding encoder = new ASCIIEncoding();
                var msg = encoder.GetString(message, 0, bytesRead);
                System.Diagnostics.Debug.WriteLine(msg);
                if (string.IsNullOrWhiteSpace(msg))
                    SendMessage(msg);
                else
                {
                    history.AppendLine(msg);
                    tbHistory.SetPropertyThreadSafe(() => tbHistory.Text, history.ToString());
                }
            }

            tcpClient.Close();
        }


        private void btnBroadcast_Click(object sender, EventArgs e)
        {
            if (clientStream != null && client != null && client.Connected)
            {
                SendMessage(tbMessage.Text);
                tbMessage.Text = string.Empty;
            }
        }

        private void SendMessage(string msg)
        {
            ASCIIEncoding encoder = new ASCIIEncoding();
            byte[] buffer = encoder.GetBytes(msg);
            clientStream.Write(buffer, 0, buffer.Length);
            clientStream.Flush();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            if (clientStream != null && client != null && client.Connected)
            {
                clientStream.Close();
                client.Close();
            }
            Application.Exit();

        }
    }