Question

In my application I have three asynchronous events.

After all of them are complete I need to call some Method1().

How can I implement this logic?

Update

Here is one of my asynchronous events:

 public static void SetBackground(string moduleName, Grid LayoutRoot)
        {
            var feedsModule = FeedHandler.GetInstance().ModulesSetting.Where(type => type.ModuleType == moduleName).FirstOrDefault();
            if (feedsModule != null)
            {
                var imageResources = feedsModule.getResources().getImageResource("Background") ??
                                     FeedHandler.GetInstance().MainApp.getResources().getImageResource("Background");

                if (imageResources != null)
                {

                    //DownLoad Image
                    Action<BitmapImage> onDownloaded = bi => LayoutRoot.Background = new ImageBrush() { ImageSource = bi, Stretch = Stretch.Fill };
                    CacheImageFile.GetInstance().DownloadImageFromWeb(new Uri(imageResources.getValue()), onDownloaded);
                }
            }
        }

Answer 1

Bit field (or 3 booleans) set by each event handler. Each event handler checks that the condition is met then calls Method1()

tryMethod1()
{
   if (calledEvent1 && calledEvent2 && calledEvent3) {
       Method1();
       calledEvent1 = false;
       calledEvent2 = false;
       calledEvent3 = false;
   }
}


eventHandler1() {
    calledEvent1 = true; 
    // do stuff
    tryMethod1();
}