ServerApp

/**********/ /---------CLIENT-------------/ using System.Net; using System.Net.Sockets;

internal class TCPServer { public static void Main() { Console.WriteLine("Clinet");

    Int32 port = 13000;

   // TcpClient client = new TcpClient(server, port);


    Console.WriteLine("Your Message");
    var message = Console.ReadLine();

    Connect(message);
}


static void Connect(string message)
{
    string server = "127.0.0.1";
    try
    {
        int port = 13000;
        using TcpClient client = new TcpClient(server, port);
        byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
        NetworkStream stream = client.GetStream();
        stream.Write(data, 0, data.Length);
        Console.WriteLine("Sent: {0}", message);
        data = new byte[256];
        String responseData = String.Empty;
        int bytes = stream.Read(data, 0, data.Length);
        responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
        Console.WriteLine("Received: {0}", responseData);
    }
    catch (ArgumentNullException e)
    {
        Console.WriteLine("ArgumentNullException: {0}", e);
    }
    catch (SocketException e)
    {
        Console.WriteLine("SocketException: {0}", e);
    }

    Console.WriteLine("\n Press Enter to continue...");
    Console.Read();
}

}

//-------SERVE

static void Connect(String server, String message) { try { // Create a TcpClient. // Note, for this client to work you need to have a TcpServer // connected to the same address as specified by the server, port // combination. Int32 port = 13000;

// Prefer a using declaration to ensure the instance is Disposed later.
using TcpClient client = new TcpClient(server, port);

// Translate the passed message into ASCII and store it as a Byte array.
Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);

// Get a client stream for reading and writing.
NetworkStream stream = client.GetStream();

// Send the message to the connected TcpServer.
stream.Write(data, 0, data.Length);

Console.WriteLine("Sent: {0}", message);

// Receive the server response.

// Buffer to store the response bytes.
data = new Byte[256];

// String to store the response ASCII representation.
String responseData = String.Empty;

// Read the first batch of the TcpServer response bytes.
Int32 bytes = stream.Read(data, 0, data.Length);
responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
Console.WriteLine("Received: {0}", responseData);

// Explicit close is not necessary since TcpClient.Dispose() will be
// called automatically.
// stream.Close();
// client.Close();

} catch (ArgumentNullException e) { Console.WriteLine("ArgumentNullException: {0}", e); } catch (SocketException e) { Console.WriteLine("SocketException: {0}", e); }

Console.WriteLine("\n Press Enter to continue..."); Console.Read(); }

APP

/---SERVER-----/

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

internal class TCPServer { public static void Main() { Console.WriteLine("Server"); TcpListener server = null; Int32 port = 13000; IPAddress localAddr = IPAddress.Parse("127.0.0.1"); server = new TcpListener(localAddr, port); server.Start(); byte[] bytes = new byte[256]; string data = null; while (true) { Console.Write("Waiting for a connection… "); TcpClient client = server.AcceptTcpClient(); Console.WriteLine("Connected!"); data = null; int i; NetworkStream stream = client.GetStream(); while ((i = stream.Read(bytes, 0, bytes.Length)) != 0) { data = System.Text.Encoding.ASCII.GetString(bytes, 0, i); Console.WriteLine("Received: {0}", data); data = data.ToUpper(); byte[] msg = System.Text.Encoding.ASCII.GetBytes(data); stream.Write(msg, 0, msg.Length); Console.WriteLine("Sent: {0}", data); } client.Close(); Console.WriteLine("Prss Key"); Console.Read(); } } }