TcpClient Read and Write Events

I am able to read and write string over StreamWriter and StreamReader. However I want to call StreamReader.ReadLine() when I really get a string from a server. I do not want to wait the server to send me a string. I want to handle them with events. Any idea?

Current code:

     private StreamWriter writer;
     private StreamReader reader;
 
 
 
     void Start() {
         TcpClient client = new TcpClient(serverAddress, serverPort);
         if (client.Connected) {
             NetworkStream socketStream = client.GetStream();
             writer = new StreamWriter(socketStream);
             reader = new StreamReader(socketStream);
             
             RequestLobby();
             Debug.Log("Integer Sent!");
         } else {
             Debug.Log("Connection Error!");
         }
     }
 
     private void RequestLobby() {
         writer.WriteLine(LOBBY_SERVICE_CODE);
         writer.Flush();
     }