title: Fastest way to check if WCF endpoint is listening
body: <p>Often, if a WCF endpoint is unavailable (in my case, usually because the service host is not running), I'll get an EndpointNotFoundException after a timeout.  I'd like to have a fast way to query the service to see if it's available without having to rely on the normal timeout.  In other words, I want to keep a normal timeout for normal circumstances, but for a quick "ping" of the endpoint, I want it to fail fast if it's not available right away.</p>
  
  <p>How could this be accomplished?</p>