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     static internal void server()
        {
            while (true)
            {
                Console.WriteLine("Function {0} start", "server()");
                TcpListener listener = new TcpListener(IPAddress.Any, port);
                Console.WriteLine("Listening on Port {0}", port);
                try
                {
                    listener.Start();
                    Console.WriteLine("Start listening...");
                    while (!listener.Pending())
                    {
                        Console.WriteLine("No incoming requests - Waiting!");
                        Thread.Sleep(200);
                    }
                    clientSocket = listener.AcceptSocket();
                    Thread tacceptedSocket = new Thread(acceptedSocket);
                    tacceptedSocket.Start();
                }
                catch (Exception serverexc)
                {
                    Console.WriteLine("Error: {0}", serverexc);
                }
            }
        }					

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byte[] bytearray = new byte[Size];
int size = 0;
while ((size = socket.Receive(bytearray, SocketFlags.None) > 0) 
{
    // ???? Mein Problem....
}					

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        public static void Senden(string daten)
        {
            //Den String in Bytes encodieren und auf den NetzwerkStream schreiben
            Byte[] datenBytes = Encoding.ASCII.GetBytes(daten);
            ns.Write(datenBytes, 0, datenBytes.Length);
        }
        
        public static string HoleString()
        {
            //Die Menge der abrufbaren Daten des TcpClients abfragen
            int menge = client.Available;
            //Solange keine Daten abrufbar sind
            while (menge == 0) 
            {
                //Menge der abrufbaren Daten abfragen
                menge = client.Available;
            }
            //Die Datenbytes Encodieren und den String zurück geben
            Byte[] datenBytes = new Byte[menge];
            ns.Read(datenBytes, 0, datenBytes.Length);
            string daten = Encoding.ASCII.GetString(datenBytes);
            return daten;
        }