Paint.AppDelegate.DidEnterBackground C# (CSharp) Method

        public override void DidEnterBackground(UIApplication application)
        {
            // This is called when we enter the background.
            // We are never notified if we are terminated.  Therefore we should take this opportunity to save the
            // current image and info file etc in case we are then terminated
            // Then, if monogame is fixed for saving/loading images then we can just leave the app running in the
            // foreground and we'll be able to carry on.
            // However if not fixed then we'll have to go back to monotouch front end and let them pick the picture
            // and carry on - problem is we lose our undo/redo buffer unless we also save all of those images?!?!
            if (this.paintApp != null)
            {
                this.paintApp.ForceSaveAndExit();
            }
            else if (this.playBackApp != null)
            {
                this.playBackApp.ForcePause();
            }
        }