<Query Kind="Program">
  <Namespace>System.Net</Namespace>
  <Namespace>System.Net.Sockets</Namespace>
</Query>

const int PORT_NO = 3006;
const string SERVER_IP = "127.0.0.1";

static void Main(string[] args)
{
	//---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();

	//---incoming client connected---
	TcpClient client = listener.AcceptTcpClient(); 

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

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

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

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