Sending a value from server to client with sockets

Question

I am using the following projects in order to create an asynchronous communication between server and client sockets. When I am running those projects I am sending a message

Answer 1

On page https://msdn.microsoft.com/en-us/library/fx6588te%28v=vs.110%29.aspx see method AcceptCallback (it's called when client connects). There is line Socket handler = listener.EndAccept(ar);. This happens for each client when it connects, so keep these Socket instances to some list. When you want to send data to clients, use Send method from that same example with each socket from list (or selectively if you want to send only to some clients).

private static void Send(Socket handler, String data) {
    // Convert the string data to byte data using ASCII encoding.
    byte[] byteData = Encoding.ASCII.GetBytes(data);

    // Begin sending the data to the remote device.
    handler.BeginSend(byteData, 0, byteData.Length, 0,
        new AsyncCallback(SendCallback), handler);
}