Requests a registered object to unregister.
Assembly: System.Web (in System.Web.dll)
The application manager will call the method to ask a registered object to unregister. During processing of the method, the registered object must call the HostingEnvironment.UnregisterObject method.
The method is first called with the immediate parameter set to false. The object can either complete processing, call the UnregisterObject method, and then return or it can return immediately and complete processing asynchronously before calling the UnregisterObject method.
If the registered object does not complete processing before the application manager's time-out period expires, the method is called again with the immediate parameter set to true. When the immediate parameter is true, the registered object must call the UnregisterObject method before returning; otherwise, its registration will be removed by the application manager.