Listen to TCP Client

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C#

I have a TCP client that I need to Listen and send responses. What’s the best way to achieve this with c#?
I’ve done something in the past but I was the client, in this situation I need to be the server. I’ve been searching a way to connect to the client through a given port and listen/send data….but with no results….

Here's my code so far....

private void ListeningThread() // let's listen in another thread instead!!
       {
           int port = 12345; // change as required

           this.listener = new TcpListener(IPAddress.Any, port);

           try
           {
               this.listener.Start();
           }
           catch (Exception e) { MessageBox.Show("couldn't bind to port " + port + " -> " + e.Message); return; }



           while (true)
           {





               Thread.Sleep(30);
           }
       }

Now I need, in the while cicle, to receive data and convert it to a string...