using System;
using System.Net.Sockets;
using System.IO;

class ProgClient {
   static readonly string host = "localhost";
   static readonly ushort port = 50000;

   static void Main() {
      TcpClient tcpClient;
      try{
        // Invoking the 'TcpClient' constructor raises an exception
        // if it can't connect to the server.
        tcpClient = new TcpClient(host,port);
        Console.WriteLine("Connection established with {0}:{1}",host,port);
         
        // Initialize the stream to communicate with the server
        // available for sending and receiving data.
        NetworkStream networkStream = tcpClient.GetStream();
        StreamWriter streamWriter =new StreamWriter( networkStream );
        StreamReader streamReader =new StreamReader( networkStream );
        try {
           string sSend = "Hi from the client!";
           string sReceived;
           for(int i=0;i<3;i++) {
              // Send data to the server.
              Console.WriteLine( "Client  -> Server :" + sSend );
              streamWriter.WriteLine( sSend );
              streamWriter.Flush();
              // Receiving data from the server.
              sReceived = streamReader.ReadLine();
              Console.WriteLine( "Server  -> Client :" + sReceived );
           }
        }
        finally{
           streamWriter.Close();
           streamReader.Close();
           networkStream.Close();
        }
      }
      catch(Exception e) {
        Console.WriteLine( e.Message );
        return;
      }
   }
}