C# TCP

csharp_client_server_tcp_readme.md

https://stackoverflow.com/a/10182935/6620967

csharp_tcp_client.cs

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace TestClient
{
    internal static class Program
    {
        const int PORT_NO = 5000;
        const string SERVER_IP = "127.0.0.1";
        
        private static void Main(string[] args)
        {
            Console.WriteLine("---data to send to the server---");
            string textToSend = DateTime.Now.ToString();

            Console.WriteLine("--- create a TCPClient object at the IP and port no.---");
            TcpClient client = new TcpClient(SERVER_IP, PORT_NO);
            NetworkStream nwStream = client.GetStream();
            byte[] bytesToSend = ASCIIEncoding.ASCII.GetBytes(textToSend);

            Console.WriteLine("--- send the text ---");
            Console.WriteLine("Sending : " + textToSend);
            nwStream.Write(bytesToSend, 0, bytesToSend.Length);

            Console.WriteLine("--- read back the text ---");
            byte[] bytesToRead = new byte[client.ReceiveBufferSize];
            int bytesRead = nwStream.Read(bytesToRead, 0, client.ReceiveBufferSize);
            client.Close();
            Console.WriteLine("Received : " + Encoding.ASCII.GetString(bytesToRead, 0, bytesRead));
            Console.WriteLine("--- this is the end ---");
            //Console.ReadLine();
        }
    }
}

csharp_tcp_server.cs

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace TestServer
{
    class Program
    {
        const int PORT_NO = 5000;
        const string SERVER_IP = "127.0.0.1";

        static void Main(string[] args)
        {
            Console.WriteLine("--- listen at the specified IP and port no. ---");
            IPAddress localAdd = IPAddress.Parse(SERVER_IP);
            TcpListener listener = new TcpListener(localAdd, PORT_NO);
            Console.WriteLine("Listening...");
            listener.Start();

            Console.WriteLine("--- incoming client connected ---");
            TcpClient client = listener.AcceptTcpClient();

            Console.WriteLine("--- get the incoming data through a network stream ---");
            NetworkStream nwStream = client.GetStream();
            byte[] buffer = new byte[client.ReceiveBufferSize];

            Console.WriteLine("--- read incoming stream ---");
            int bytesRead = nwStream.Read(buffer, 0, client.ReceiveBufferSize);

            Console.WriteLine("--- convert the data received into a string ---");
            string dataReceived = Encoding.ASCII.GetString(buffer, 0, bytesRead);
            Console.WriteLine("Received : " + dataReceived);

            Console.WriteLine("--- write back the text to the client ---");
            Console.WriteLine("Sending back : " + dataReceived);
            nwStream.Write(buffer, 0, bytesRead);
            client.Close();
            listener.Stop();
            Console.WriteLine("--- this is the end ---");
            //Console.ReadLine();
        }
    }
}