如何在HttpWebRequest中更改原始IP

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

public class HttpWebRequestExample
{
    public static void Main()
    {
        string url = "http://www.example.com";
        IPAddress ipAddress = IPAddress.Parse("192.168.1.1");
        IPEndPoint remoteEP = new IPEndPoint(ipAddress, 80);

        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        socket.Connect(remoteEP);

        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        // Process the response here.

        response.Close();
        socket.Close();
    }

    public static IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
    {
        IPAddress ipAddress = IPAddress.Parse("192.168.1.1");
        IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 0);
        return localEndPoint;
    }
}