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C#-Quelltext

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace ChatServer
{
    public class Program
    {

        static void Main(string[] args)
        {
            const int port = 31243;
            TcpListener listener = null;

            try
            {
                //start listen to Port
                Console.WriteLine("Start server...");
                listener = new TcpListener(IPAddress.Any, port); //Every Computer is allowed
                listener.Start();
                Console.WriteLine("Server started!");

                //Buffer for reading data
                byte[] buffer = new byte[256];

                while (true)
                {
                    //establish connection
                    Console.WriteLine("Listening on port " + port);
                    Console.WriteLine("Waiting for connection...");
                    TcpClient client = listener.AcceptTcpClient();
                    Console.WriteLine("Connection Established!");

                    NetworkStream inOut = client.GetStream();

                    int i;

                    //Loop to receive data by client
                    while ((i = inOut.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        //convert the data back to string and show it
                        string data = Encoding.ASCII.GetString(buffer, 0, i);
                        Console.WriteLine("Received: " + data + " with " + i + " bytes");

                        //Write Back the text to the client
                        Console.WriteLine("Sending back: " + data);
                        inOut.Write(buffer, 0, i);
                    }
                    //Close connection
                    client.Close();
                    Console.WriteLine("Connection closed");
                    Console.ReadKey();
                }      
            }
            catch (Exception e)
            {
                throw new Exception("Error: ", e); //funktioniert nicht
            }
            finally
            {
                //stop listening for new clients
                listener.Stop();
            }
        }
    }
}

C#-Quelltext

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Security;
using System.Security.Permissions;

namespace ChatClient
{
    public class Program
    {
        static void Main(string[] args)
        {
            TcpClient client = null;
            try
            {
                //type the Server IP
                Console.WriteLine("Insert IP from Server: ");
                string ip = Console.ReadLine();

                //open connection
                client = new TcpClient(ip, 31243);
                NetworkStream inOut = client.GetStream();

                while (true)
                {
                    //read text to send
                    Console.WriteLine("Connection established!");
                    Console.WriteLine("Something to send to server: ");
                    string eingabe = Console.ReadLine();

                    //convert and send
                    byte[] bytes = ASCIIEncoding.ASCII.GetBytes(eingabe);
                    Console.WriteLine("Sending...");
                    inOut.Write(bytes, 0, bytes.Length);

                    //read back
                    byte[] bytesToRead = new byte[client.ReceiveBufferSize];
                    int answer = inOut.Read(bytesToRead, 0, client.ReceiveBufferSize);

                    //convert and output
                    string answerString = ASCIIEncoding.ASCII.GetString(bytesToRead, 0, answer);
                    Console.WriteLine("From Server: " + answerString);
                }              
            }
            catch
            {
                Console.WriteLine("Error. Programm wird beendet");
                Console.ReadKey();
            }
            finally
            {
                client.Close();
            }
        }
    }
}