How do I clear System.Net client DNS cache?

Question

I\'m using the .NET WebRequest while changing my HOSTS file. I\'m observing that System.Net doesn\'t honor those changes - how can I make it do so?

I have a number o

Answer 1

I finally dug up the obscure command from MSDN that fixes this:

ServicePointManager.DnsRefreshTimeout = 0;

As I unwound all the weird things I'd tried previously, I discovered one other setting that I need along with the one above; on the request object, turn off keep-alive:

request.KeepAlive = false;