This function will normally be called for you automatically by Android.App.LoaderManager when destroying a Loader. When using a Loader with Android.App.LoaderManager, you must not call this method yourself, or you will conflict with its management of the Loader. Resets the state of the Loader. The Loader should at this point free all of its resources, since it may never be called again; however, its Loader.StartLoading may later be called at which point it must be able to start running again.
This updates the Loader's internal state so that Loader.IsStarted and Loader.IsReset will return the correct values, and then calls the implementation's Loader.OnReset.
Must be called from the process's main thread.