using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
namespace ChatServer
{
 class Program
 {
  static void Main(string[] args)
  {
   bool cancel = false;
   byte[] buffer = new byte[1024];
   string message;
   byte[] messageBytes;
   int count = 0;
   TcpListener tcpListener = new TcpListener(new IPEndPoint(IPAddress.Any, 13000));
   tcpListener.Start();
   Console.WriteLine("Waiting for a connection... ");
   TcpClient tcpClient = tcpListener.AcceptTcpClient();
   Console.WriteLine("Connected.");
   NetworkStream stream = tcpClient.GetStream();
   
   Task.Factory.StartNew(() => 
   {
    while ((count = stream.Read(buffer, 0, buffer.Length)) != 0)
    {
     Console.WriteLine($"{DateTime.Now:yyyy-MM-dd HH:mm:ss fff} Reply from server {tcpClient.Client.LocalEndPoint.ToString()}:{Encoding.UTF8.GetString(buffer, 0, count)}");
    }
   });
     
   Task t = Task.Factory.StartNew(() => 
   {
    while(!cancel)
    {
     message = Console.ReadLine();
     if (message.ToUpper() == "Y")
     {
      cancel = true;
      return;
     }
     messageBytes = Encoding.UTF8.GetBytes(message);
     stream.Write(messageBytes, 0, messageBytes.Length);
    }
   });
      
   if (cancel) tcpClient.Close();
    
   while (true)
   {
    if (t != null && t.IsCompleted) break;
   }
  }
 }
}

using System;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
namespace ChatClient
{
 class Program
 {
  static void Main(string[] args)
  {
   bool cancel = false;
   byte[] buffer = new byte[1024];
   string message;
   byte[] messageBytes;
   int count = 0;
   try
   {
    TcpClient tcpClient = new TcpClient(new IPEndPoint(Dns.GetHostEntry(Dns.GetHostName()).AddressList.Where(p => p.AddressFamily == AddressFamily.InterNetwork).First(), 14000));
    tcpClient.Connect(new IPEndPoint(IPAddress.Parse("192.168.94.26"), 13000));
    NetworkStream stream = tcpClient.GetStream();
    
    Task.Factory.StartNew(() =>
    {
     while ((count = stream.Read(buffer, 0, buffer.Length)) != 0)
     {
      Console.WriteLine($"{DateTime.Now:yyyy-MM-dd HH:mm:ss fff} Reply from client {tcpClient.Client.LocalEndPoint.ToString()}:{Encoding.UTF8.GetString(buffer, 0, count)}");
     }
    });
    Task t = Task.Factory.StartNew(() =>
    {
     while (!cancel)
     {
      message = Console.ReadLine();
      if (message.ToUpper() == "Y")
      {
       cancel = true;
       return;
      }
      messageBytes = Encoding.UTF8.GetBytes(message);
      stream.Write(messageBytes, 0, messageBytes.Length);
      Thread.Sleep(10);
     }
    });
    if (cancel) tcpClient.Close();
    
    while (true)
    {
     if (t != null && t.IsCompleted) break;
    }
   }
   catch(Exception ex)
   {
    Console.WriteLine(ex.Message);
    Console.ReadKey();
   }
   } 
 }
}