How to download image in background task in window 8 using C#? the problem is code is break but m not getting any exception ?

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Windows

Win8

string internetUri = SampleItemList[(int)isoSetting.Values["ItemList"]+1].ImageLink;
StorageFolder folder = Windows.Storage.ApplicationData.Current.LocalFolder;
StorageFile file = await folder.CreateFileAsync("myImage" + ((int)isoSetting.Values["RefreshCount"]-1) + ".jpg", CreationCollisionOption.ReplaceExisting);
var downloader = new Windows.Networking.BackgroundTransfer.BackgroundDownloader();
DownloadOperation d = downloader.CreateDownload(new Uri(internetUri), file);
await d.StartAsync();