Starts shutting down the web application associated with this host and removes registered objects from the system.
Use the HostingEnvironment.InitiateShutdown method to stop a web application domain and remove any objects registered with the HostingEnvironment.RegisterObject(IRegisteredObject) method. This method returns immediately, before the shutdown is complete.
The IRegisteredObject.Stop(bool) method is called on each registered object with the passed parameter set to false to allow each registered object to shut down asynchronously. After waiting for the amount of time specified in the shutdownTimeout attribute of the hostingEnvironment configuration element, the IRegisteredObject.Stop(bool) method is called again with the passed parameter set to true for each registered object remaining.
Once all registered objects have finished shutting down, the System.Web.Hosting.HostingEnvironment objects shuts down the application domain.