c# TCPServer seems not to respond to client dissconnection

Question

This TCP Server Works, but does not process the Client disconnection I tried the TCP Client c# and Xamarin for the Android Phone\Tablet Both Connect and Send Data correctly, But the Server seems not to respond the client dis-connection The Purpose is to get a phone to control a C# Smart House app Thanks InAdvanced

using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace dwkTCPServerAndroidTablet
{
    public partial class Form1 : Form
    {
        //Global Variables
        private bool isServerRunning = false;
        public Thread t = null;
        public Thread server = null;
        private const int port = 6000;// 89;
        int i = 0; // number of clients
        private TcpListener listener = null;
      //  TcpClient client = null;
       // NetworkStream stream = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void btn_StartServer_Click(object sender, EventArgs e)
        {
            i = 0;
            server = new Thread(new ThreadStart(beginserver)); //can pass data
            server.IsBackground = true; //terminated when you close your application.
            server.Start(); //starts
            isServerRunning = true;
        }

        public void beginserver()
        {
            btn_StartServer.BackColor = Color.Red;
            TcpClient newclient = new TcpClient();
            listener = new TcpListener(IPAddress.Any, port);
            listener.Start();
            //thread safe
            this.lbl_ServerStatus.Invoke(new MethodInvoker(delegate ()
            {
                lbl_ServerStatus.Text = "Server has  Started ";
            }));
            this.lbl_ClientStatus.Invoke(new MethodInvoker(delegate ()
            {
                lbl_ClientStatus.Text = "No Clients! ... ";
            }));
            //bt_Connect.Enabled = false;//grey out Connect Button
            isServerRunning = true;

            while (isServerRunning)
            {
                i++;
                newclient = listener.AcceptTcpClient();
                // client found.
                // create a thread to handle communication
                t = new Thread(new ParameterizedThreadStart(HandleClient)); //can pass data
                t.IsBackground = true; //terminated when you close your application.
                t.Start(newclient);
            }
            listener.Stop();
        }

        private void HandleClient(object newclient)
        {
            this.lbl_ClientStatus.Invoke(new MethodInvoker(delegate ()
            {
                lbl_ClientStatus.Text = "Client has Connected! ... ";
            }));
            int clientnumber = i;
            // retrieve client from parameter passed to thread
           TcpClient client = (TcpClient)newclient;

           NetworkStream stream = client.GetStream();

            byte[] bytesFrom = new byte[1024];
            
            while (client.Connected)
            {
               if(stream.DataAvailable)
                {
                    //  UnicodeEncoding ue = new UnicodeEncoding();// String => Byte  &&  Byte => String
                    byte[] stream2 = new byte[1024];
                    stream.Read(stream2, 0, stream2.Length);
                    string msg = Encoding.ASCII.GetString(stream2);
                   /// MessageBox.Show("Client sent " + msg);
                   lbl_ClientText.Text = msg;
                }
            }
///////////////////////////////////////////////////////////////
//PROBLEM
            this.lbl_ClientStatus.Invoke(new MethodInvoker(delegate ()
            {
                lbl_ClientStatus.Text = "No Clients! ... ";
            }));
            stream.Close();
            client.Close();
            t.Abort();
        }
        ////////////////////////////////////////////////////////
    }
}