在XP上使用Multicast的C#SocketException

SocketException：提供了无效的参数.

ErrorCode是10022.

XP上的防火墙已被禁用.

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

public class SocketTest
{
    [STAThread]
    public static void Main()
    {
        MySocket s = new MySocket();

        Console.WriteLine("done");
        Console.ReadLine();
    }

    public class MySocket : Socket
    {
        public const ushort SocketTtl = 4;
        public const string Address = "239.255.255.250";

        public IPAddress IPAddress = IPAddress.Parse(Address);

        public MySocket()
            : base(AddressFamily.InterNetwork,SocketType.Dgram,ProtocolType.Udp)
        {
            SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.Broadcast,true);
            SetSocketOption(SocketOptionLevel.IP,SocketOptionName.MulticastTimeToLive,SocketTtl);

            // This line throws SocketException: An invalid argument was supplied
            // SocketException.ErrorCode: 10022
            SetSocketOption(SocketOptionLevel.IP,SocketOptionName.AddMembership,new MulticastOption(IPAddress));
        }
    }
}

有任何想法吗？