private async void heatmapSessionsListView_Drop(object sender, DragEventArgs e) { ShowHeatmapLoading(); if (e.DataView.Contains(StandardDataFormats.StorageItems)) { var items = await e.DataView.GetStorageItemsAsync(); if (items.Count > 0) { foreach (var item in items) { var file = item as StorageFile; if (SessionCollection.IsSupportedFileExtension(file.FileType)) { await AddItemsFromFileAsync(file); } } } } //await Task.Factory.StartNew(() => System.Threading.Thread.Sleep(2000)); HideHeatmapLoading(); }