/// <summary>
 /// Called by each ad payload handler
 /// </summary>
 private void AdPayloadHandlerPlugins_HandleCompleted(object sender, HandleCompletedEventArgs e)
 {
     if (e.Success)
         OnAdSucceeded(e.AdSource);
     else
         OnAdFailed(e.AdSource);
 }
 protected virtual void OnHandleCompleted(HandleCompletedEventArgs eventArgs)
 {
     if (HandleCompleted != null) HandleCompleted(this, eventArgs);
 }