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namespace TCP_Client
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                TcpClient client = new TcpClient("127.0.0.1", 8080);
                StreamReader reader = new StreamReader(client.GetStream());
                StreamWriter writer = new StreamWriter(client.GetStream());
                string s = string.Empty;

                while(!s.Equals("Exit"))
                {
                    Console.Write("Enter a string to send to the server...");
                    s = Console.ReadLine();
                    Console.WriteLine();
                    writer.WriteLine(s);
                    writer.Flush();
                    string server_string = reader.ReadLine();
                    Console.WriteLine(server_string);
                }

                reader.Close();
                writer.Close();
                client.Close();
            }
            catch(Exception ex)
            {
                Console.Write(ex.Message);
            }
            finally
            {

            }
        }
    }
}                    

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namespace TCP_Server
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpListener listener = null;
            try
            {
                listener = new TcpListener(IPAddress.Parse("127.0.0.1"), 8080);
                listener.Start();
                Console.WriteLine("MultiThreadEchoServer start...");

                while(true)
                {
                    Console.WriteLine("Waiting for connection...");
                    TcpClient client = listener.AcceptTcpClient();
                    Console.WriteLine("Accepted new client connection...");
                    Thread t = new Thread(ProcessClientRequest);
                    t.Start(client);

                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                if (listener != null)
                    listener.Stop();
            }
        }
        private static void ProcessClientRequest(object argument)
        {
            TcpClient client = (TcpClient)argument;
            try
            {
                StreamReader reader = new StreamReader(client.GetStream());
                StreamWriter writer = new StreamWriter(client.GetStream());
                string s = string.Empty;

                while(!(s = reader.ReadLine()).Equals("Exist") || (s == null))
                {
                    Console.WriteLine("From client -> " + s);
                    writer.WriteLine("From Server -> " + s);
                    writer.Flush();
                }

                reader.Close();
                writer.Close();
                client.Close();
                Console.WriteLine("Closing client connection");
            }
            catch (IOException ex)
            {
                Console.WriteLine("Problem with client connection. Thread exists");
            }
            finally
            {
                if(client != null)
                {
                    client.Close();
                }
            }
        }
    }
}