C# Networking Server/Client part 2

/* This is my second Pastebin for networking with C#. This is what I could find out on how to use Loops to send and Receive Data from Server and Client*/

//Server:
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 = 54321;
            TcpListener listener = null; //just something so we can close it in the finally-brackets

            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, sadly this time we have to define a specific number, be sure it is enough!
                byte[] buffer = new byte[256]; //1 byte is 1 letter

                while (true) //just an endless loop that is supposed to connect more clients, because it also ends the
                                //connection but we'll save this for later, you could ignore it... I think...
                {
                    //establish connection
                    Console.WriteLine("Listening on port " + port);
                    Console.WriteLine("Waiting for connection...");
                    TcpClient client = listener.AcceptTcpClient();
                    Console.WriteLine("Connection Established!");

                    //get the Data-Flow
                    NetworkStream inOut = client.GetStream();

                    int i; //need this to get the number of bytes

                    //Loop to receive data by client. Like "if the bytes (that contain our message) you receive is NOT 0..."
                    while ((i = inOut.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        //convert the bytes 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); //we don't have to convert it back to bytes because this is what we already received
                    }
                    //Close connection
                    client.Close();
                    Console.WriteLine("Connection closed");
                    Console.ReadKey();
                }
            }
            catch
            {
                Console.WriteLine("Error");
            }
            finally
            {
                //stop listening for new clients
                listener.Stop();
            }
        }
    }
}

//Client
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; //again it is here so we have defined SOMETHING for it to use it later to close the connection

            try
            {
                //type the Server IP
                Console.WriteLine("Insert IP from Server: ");
                string ip = Console.ReadLine();

                //open connection and get something for the DataStream
                client = new TcpClient(ip, 54321);
                NetworkStream inOut = client.GetStream();
                Console.WriteLine("Connection established!");

                while (true) //again an endless loop but this time we need it^^
                {
                    //read text to send
                    Console.WriteLine("Something to send to server: ");
                    string message = Console.ReadLine();

                    //convert to bytes and send
                    byte[] bytes = ASCIIEncoding.ASCII.GetBytes(message);
                    Console.WriteLine("Sending...");
                    inOut.Write(bytes, 0, bytes.Length); //byte (the message in bytes), 0 (no idea what), bytes-Length (Length of letters)

                    //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");
                Console.ReadKey();
            }
            finally
            {
                client.Close();
            }
        }
    }
}

/* I hope this helps some people to understand more it took me a damn lot of time to find all this pieces of information and put it into something I can understand myself. Part 3 will come soon, it will also be a loop but I want to add Threading so our Server can handle each Client better. And I wanna do what so many beginners tried: To have a sprite (like a dot) in one Client that you can move with arrow-Keys (I already have this though), but I want it to synchronize with a second Client (and a second dot of course), so 2 Client can see their own dot and the other one moving around*/