How to send a packet to a specific ip, tcp client client BeginSendTo?

Question

client-server

Good day to all, I need to send a message from the client to the client (there is a server between them, but I think it will not be needed).
The code of the button on the form for sending the byte[] array, ip is taken from the listbox.

string[] s = listStation.SelectedItem.ToString().Split(':');

            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse(s[0]), Convert.ToInt32(s[1]));
            Socket ss = new Socket(ipep.Address.AddressFamily,
                                     SocketType.Stream,
                                        ProtocolType.Tcp);

            client.Client.BeginSendTo(msg, 0, msg.Length, 0, ipep, new AsyncCallback(DoAcceptTcpClientCallback), ss);

Helper functions for calling BeginSendTo

public static ManualResetEvent allDone = new ManualResetEvent(false);

        public static void DoAcceptTcpClientCallback(IAsyncResult ar)
        {
            // Get the listener that handles the client request.
            TcpListener listener = (TcpListener)ar.AsyncState;

            // End the operation and display the received data on 
            // the console.
            TcpClient client = listener.EndAcceptTcpClient(ar);

            // Process the connection here. (Add the client to a
            // server table, read data, etc.)
            //Console.WriteLine("Client connected completed");

            // Signal the calling thread to continue.
            allDone.Set();
        }

As a result, after executing this code, the application crashes, what needs to be corrected?