namespace Server
{ class Program { const int PORT_NO = 5000; 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(); } }
}

namespace Client
{ class Program { const int PORT_NO = 5000; const string SERVER_IP = "127.0.0.1"; static void Main(string[] args) { //---data to send to the server--- string textToSend = DateTime.Now.ToString(); //---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); //---send the text--- Console.WriteLine("Sending : " + textToSend); nwStream.Write(bytesToSend, 0, bytesToSend.Length); //---read back the text--- byte[] bytesToRead = new byte[client.ReceiveBufferSize]; int bytesRead = nwStream.Read(bytesToRead, 0, client.ReceiveBufferSize); Console.WriteLine("Received : " + Encoding.ASCII.GetString(bytesToRead, 0, bytesRead)); Console.ReadLine(); client.Close(); } }
}