title: Triggering an async operation in from mvc controller
body: <p>Here is my scenario.</p>
  
  <p>I want to create a web endpoint that will kick off a service that may be long-running, perhaps 20-30 minutes. I'd like to return an HttpResponseResult immediately and trigger the service to run asynchronously, instead of having to wait for the service to complete before returning a response to client. </p>
  
  <p>What is the easiest way to go about doing this?  I don't need to return any sort of result from the service, just trigger it.</p>