title: What are the approaches to trigger ASP.NET Website server side push
body: <p>We are implementing Signalr to provide real time updates to browser clients. But we are curretnly stuck as we need to make http server itself (IIS+ASP) detect the changes from database and external services or from any other source without polling?
  I believe this should be a common problem with all real time websites (irrespective of what technology is used for server side push SignalR, Comet or WebSync). Please provide what are general approaches used in such situations?</p>