C# Port Forwarding

Socket.class

using System;
using System.Net;
using System.Net.Sockets;
 
namespace BrunoGarcia.Net
{
    public class TcpForwarderSlim
    {
        private readonly Socket _mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 
        public void Start(IPEndPoint local, IPEndPoint remote)
        {
            _mainSocket.Bind(local);
            _mainSocket.Listen(10);
 
            while (true)
            {
                var source = _mainSocket.Accept();
                var destination = new TcpForwarderSlim();
                var state = new State(source, destination._mainSocket);
                destination.Connect(remote, source);
                source.BeginReceive(state.Buffer, 0, state.Buffer.Length, 0, OnDataReceive, state);
            }
        }
 
        private void Connect(EndPoint remoteEndpoint, Socket destination)
        {
            var state = new State(_mainSocket, destination);
            _mainSocket.Connect(remoteEndpoint);
            _mainSocket.BeginReceive(state.Buffer, 0, state.Buffer.Length, SocketFlags.None, OnDataReceive, state);
        }
 
        private static void OnDataReceive(IAsyncResult result)
        {
            var state = (State)result.AsyncState;
            try
            {
                var bytesRead = state.SourceSocket.EndReceive(result);
                if (bytesRead > 0)
                {
                    state.DestinationSocket.Send(state.Buffer, bytesRead, SocketFlags.None);
                    state.SourceSocket.BeginReceive(state.Buffer, 0, state.Buffer.Length, 0, OnDataReceive, state);
                }
            }
            catch
            {
                state.DestinationSocket.Close();
                state.SourceSocket.Close();
            }
        }
 
        private class State
        {
            public Socket SourceSocket { get; private set; }
            public Socket DestinationSocket { get; private set; }
            public byte[] Buffer { get; private set; }
 
            public State(Socket source, Socket destination)
            {
                SourceSocket = source;
                DestinationSocket = destination;
                Buffer = new byte[8192];
            }
        }
    }
}

This code helped me a lot, thanks!
Can you please tell me how to close the socket?

The method below didn't work for me..(

    public void Stop()
    {
        try
        {
            _mainSocket.Shutdown(SocketShutdown.Both);
        }
        finally
        {
            _mainSocket.Close();
        }
    }

Hie i need help. i want to forward my Xampp port using C#, how can i do that. i am new to coding