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   private void Listen()

        {

            Console.WriteLine("Listener starten ...");
            TcpListener listener = new TcpListener(IPAddress.Any, _port);
            listener.Start();
            Console.WriteLine("Listener gestartet ...");
            while (true)
            {
                new Client((server)this, (TcpClient)listener.AcceptTcpClient());
            }
        }