private async Task PerformSearch()
 {
     try
     {
         activityIndicator.IsRunning = true;
         grid.Focus();
         await _collectionView.SearchAsync(search.Text);
     }
     finally
     {
         activityIndicator.IsRunning = false;
     }
 }
 private async Task PerformSearch()
 {
     try
     {
         ActivityIndicator.StartAnimating();
         Grid.BecomeFirstResponder();
         await _collectionView.SearchAsync(SearchField.Text);
     }
     finally
     {
         ActivityIndicator.StopAnimating();
     }
 }