Xamarin TcpClient Chat

private void buttonClickConnect(object sender, EventArgs e)
                {
                    client = new TcpClient();
                    IPEndPoint IP_End = new IPEndPoint(IPAddress.Parse("192.168.1.1"), int.Parse("13000"));
                    try
                    {
                        client.Connect(IP_End);
                        if (client.Connected)
                        {
                            textviewConversation.Text += "Connected to server" + "\n";
                            STR = new StreamReader(client.GetStream());
                            STW = new StreamWriter(client.GetStream());
                            STW.AutoFlush = true;
                            worker1.RunWorkerAsync();
                            worker2.WorkerSupportsCancellation = true;
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }

private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)   //sending message, here error probably
        {
            if (client.Connected)
            {
                STW.WriteLine(text_to_send);
            }
            else
            {
                Console.WriteLine("send failed !");
            }
            worker2.CancelAsync();
        }

 
//w kodzie buttonClickConnect, ns to pole klasy typu NetworkStream
ns = client.GetStream();
//w backgroundWorder2 daj coś takiego:

byte[] msg = Encoding.ASCII.GetBytes("jakas wiadomosc");
ns.Write(msg,0,msg.Leght);

 
//w kodzie buttonClickConnect, ns to pole klasy typu NetworkStream
ns = client.GetStream();
//w backgroundWorder2 daj coś takiego:

byte[] msg = Encoding.ASCII.GetBytes("jakas wiadomosc");
ns.Write(msg,0,msg.Leght);

private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)   //sending message, here error probably
        {
           

            if (client.Connected)
            {
                byte[] msg = Encoding.ASCII.GetBytes("jakas wiadomosc");
                ns.Write(msg, 0, msg.Length);<-----------@@@@@@@@@@@@@@@@@@@@@@@@ TUTAJ DAŁEM
                //STW.WriteLine(text_to_send); <------ to zakomentowałe
            }
            else 

private void buttonClickConnect(object sender, EventArgs e)
        {
            client = new TcpClient();

            IPEndPoint IP_End = new IPEndPoint(IPAddress.Parse("192.168.1.1"), int.Parse("13000"));
             
            try
            {
                client.Connect(IP_End);
                if (client.Connected)
                {
                    textviewConversation.Text += "Connected to server" + "\n";
                    STR = new StreamReader(client.GetStream());
                    STW = new StreamWriter(client.GetStream());
                    STW.AutoFlush = true;
                    ns = client.GetStream(); <-----------@@@@@@@@@@@@@@@@@@@@@@@@ TUTAJ DAŁEM
                    worker1.RunWorkerAsync();
                    worker2.WorkerSupportsCancellation = true; 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace serverDoWielu
{
    public partial class MainWindow : Window
    {
       
        private List<TcpClient> listaClientow = new List<TcpClient>();
        private List<StreamReader> listaSTR = new List<StreamReader>();
        private List<StreamWriter> listaSTW = new List<StreamWriter>();
        StreamReader STR;
        StreamWriter STW;

        private string received;
        private String text_to_send;                                            
        public BackgroundWorker worker2;
        public BackgroundWorker worker3;
        int licznikClientow;

        public MainWindow()
        {
            InitializeComponent();
            worker2 = new BackgroundWorker();
            worker2.DoWork += backgroundWorker2_DoWork;
            worker3 = new BackgroundWorker();
            worker3.DoWork += backgroundWorker3_DoWork;
            worker2.WorkerSupportsCancellation = true;
        }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            worker3.RunWorkerAsync(); 
        }

        private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)
        {
                string wiadomosc = (string)e.Argument;
                List<StreamWriter> tmp = new List<StreamWriter>(listaSTW);

                foreach (var item in tmp)      
                {
                    item.WriteLine(wiadomosc);
                }   
            
            
            worker2.CancelAsync();
        }
        private void backgroundWorker3_DoWork(object sender, DoWorkEventArgs e)                                                              
        {
            TcpListener listener = new TcpListener(IPAddress.Parse("192.168.1.1"), 13000);
            // TcpListener listener = new TcpListener(IPAddress.Parse("127.0.0.1"), 13000);

            licznikClientow = 0;
            while (true)
            {
                listener.Start(); 
                listaClientow.Add(new TcpClient()); // add new
                listaClientow[licznikClientow] = listener.AcceptTcpClient(); //przypisujemy 
                listaSTR.Add(new StreamReader(  listaClientow[licznikClientow].GetStream() ) );  // to read
                listaSTW.Add(new StreamWriter(  listaClientow[licznikClientow].GetStream() ) );   // to send 
                listaSTW[licznikClientow].AutoFlush = true; //clear

                BackgroundWorker clientThread = new BackgroundWorker();
                clientThread.WorkerSupportsCancellation = true;
                clientThread.DoWork += new DoWorkEventHandler(clientThread_DoWork);
                clientThread.RunWorkerAsync(licznikClientow);
                
                licznikClientow++;
            }
        }

        private void clientThread_DoWork(object sender, DoWorkEventArgs e)                                                               
        {
            int ktoryKlient = (int)e.Argument;
            
            
                while (listaClientow[ktoryKlient].Connected)  
                {
                try
                {
                    received = "";
                            received = listaSTR[ktoryKlient].ReadLine();
                    Console.WriteLine("@@@@@@   "+received); <------------------------------------@@@@@@@@@@@@@@@@ To wypluwa w dziesiątkach @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
                            text_to_send = received;

                            if (text_to_send != "")
                            {
                                this.textBox.Dispatcher.Invoke(DispatcherPriority.Normal, (ThreadStart)delegate () { textBox.AppendText("->> " + text_to_send + "\n"); });
                                worker2.RunWorkerAsync(text_to_send);    
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            foreach (var item in listaSTW)     // sending to all people
            {
                item.WriteLine(textBox1.Text);
            }
        }
    }
}
 

 
//[serwer]//
TcpListener l = new TcpListener(IPAddress.Any,12345);
l.Start();
TcpClient c = l.AcceptTcpClient()

byte[] buff = new byte[32];
c.GetStream().Read(buff,0,32);
string msg= Encoding.ASCII.GetString(buff);
//wyświetl wiadomość.
string reply = "simple reply to client";
byte[] r = Encoding.ASCII.GetBytes(reply);
c.GetStream().Write(r,0,r.Lenght); // czy coś takiego nie pamietam dokładnie.

//[Klient]//
TcpClient c = new Tcp(...);
c.Connect(...)
string msg = "asdf";
byte[] buff = Encoding.ASCII.GetBytes(msg);
c.GetStream().Write(buff,0,buff.Lenght);
//
byte[] receive = new byte[32];
c.GetStream().Read(receive);

//encoding i wyświetl

public class MainActivity : Activity
    {
        public TextView napis;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            SetContentView(Resource.Layout.Main);
            Button button = FindViewById<Button>(Resource.Id.MyButton);
            button.Click += Start;
            napis = FindViewById<Button>(Resource.Id.MyButton);
        }
       

        private void Start(object sender, EventArgs e)
        {
            TcpClient c = new TcpClient();
            IPEndPoint IP_End = new IPEndPoint(IPAddress.Any, 13000);
            c.Connect(IP_End);
            //c.Connect(...)
            string msg = "asdf";
            byte[] buff = Encoding.ASCII.GetBytes(msg);
            c.GetStream().Write(buff, 0, buff.Length);

            byte[] receive = new byte[32];
            var otrzymane = c.GetStream().Read(receive, 0, receive.Length); //@@@@@@@@ ??
            napis.Text = otrzymane.ToString();
        }
    } 

static void Main(string[] args)
        {

            TcpListener l = new TcpListener(IPAddress.Parse("192.168.1.1"), 12345);
            l.Start();
            TcpClient c = l.AcceptTcpClient();
            //IPAddress.Parse("192.168.1.1")

            byte[] buff = new byte[32];
            c.GetStream().Read(buff, 0, 32);
            string msg = Encoding.ASCII.GetString(buff);
            Console.WriteLine("wiadomosc: " + msg);
            string reply = "simple reply to client";
            byte[] r = Encoding.ASCII.GetBytes(reply);
            c.GetStream().Write(r, 0, r.Length);
            System.Console.ReadKey();
        } 

 
byte[] buffer = new byte[8];
int received = networkstream.Read(buffer);