public void Socket_SendToV4IPEndPointToV4Host_Throws()
{
Socket socket = new Socket(SocketType.Dgram, ProtocolType.Udp);
socket.DualMode = false;
Assert.Throws<SocketException>(() =>
{
socket.SendTo(new byte[1], new IPEndPoint(IPAddress.Loopback, UnusedPort));
});
}