Create connected and disconnected callback for a binding socket using C#

I have this binding socket:

     Socket mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
     mainSocket.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 0));

And I need to know when an extern client is connected and disconnected from my servicies( ftp, database server, app server, etc).
thank for advance.

I tried with these methods but, did not work for me.

    mainSocket.BeginConnect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 0), new AsyncCallback(ClientConnected), null);
    mainSocket.BeginDisconnect(true, new AsyncCallback(ClientDisconnected), null);

       private void ClientDisconnected(IAsyncResult ar)
       {
           // here get some client info like Ip
       }

       private void ClientConnected(IAsyncResult ar)
       {
           // here get some client info like Ip
       }