private void fileInitialisation()
{
var pictureQueryOptions = new QueryOptions();
// Don't read through all the subfolders.
pictureQueryOptions.FolderDepth = FolderDepth.Shallow;
// Apply the query on the PicturesLibrary
var pictureQuery = KnownFolders.PicturesLibrary.CreateFileQueryWithOptions(pictureQueryOptions);
// Get picture information
var picturesInformation = new FileInformationFactory(pictureQuery, ThumbnailMode.PicturesView);
picturesSource.Source = picturesInformation.GetVirtualizedFilesVector();
}