Question

As far as I know I can create a server using both TCPListener and Socket, so what is the difference between the two of them?

Socket

private Socket MainSock;
MainSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
MainSock.Bind(new IPEndPoint(IPAddress.Any, port));
MainSock.Listen(500);
MainSock.BeginAccept(AcceptConnections, new Wrapper());

TCPListener

    Int32 port = 13000;
    IPAddress localAddr = IPAddress.Parse("127.0.0.1");
    TcpListener server = new TcpListener(localAddr, port);
    server.Start();

I’m really confused. The two of them listen for connections, so what is the difference between them?

Updated Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Net.Security;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;
using System.IO;

public class Wrapper
{
    public byte[] buffer;
    public SslStream sslStream;
    public object connector;
}

public class Sock
{
    private Dictionary<string, byte> Connections;
    public event Action<Wrapper> AnnounceNewConnection;
    public event Action<Wrapper> AnnounceDisconnection;
    public event Action<byte[], Wrapper> AnnounceReceive;
    private Socket _sock;

    private X509Certificate certificate = X509Certificate.CreateFromCertFile("exportedcertificate.cer");

    public Sock(int port)
    {
        try
        {
            Connections = new Dictionary<string, byte>();
            _sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            _sock.Bind(new IPEndPoint(IPAddress.Any, port));
            _sock.Listen(500);
            _sock.BeginAccept(AcceptConnections, new Wrapper());
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
        }
    }

    private void AcceptConnections(IAsyncResult result)
    {
        Wrapper wr = (Wrapper)result.AsyncState;
        try
        {
            wr.sslStream = new SslStream(new NetworkStream(_sock.EndAccept(result), true));
            wr.sslStream.BeginAuthenticateAsServer(certificate, AcceptAuthenticate, wr);

            _sock.BeginAccept(AcceptConnections, new Wrapper());
        }
        catch (Exception e) { Console.WriteLine(e); }
    }

    private void AcceptAuthenticate(IAsyncResult result)
    {
        Wrapper wr = (Wrapper)result.AsyncState;
        try
        {
            wr.sslStream.EndAuthenticateAsServer(result);
            if (wr.sslStream.IsAuthenticated == true)
            {
                AnnounceNewConnection.Invoke(wr);
            }
        }
        catch (Exception e) { Console.WriteLine(e); }
    }

    private void ReceiveData(IAsyncResult result)
    {
        Wrapper wr = (Wrapper)result.AsyncState;
        try
        {
            AnnounceReceive.Invoke(wr.buffer, wr);
        }
        catch (Exception e) { Console.WriteLine(e); AnnounceDisconnection.Invoke(wr); }
    }
}

Answer 1

They’re just different classes that do the same thing, written at different levels. Under the hood the TCPListener undoubtedly calls something very like your first Socket-based code. It;s just there to hide you from some of the gory details.