public PodcastViewModel()
{
PodcastGroups = Enumerable.Empty <IGrouping <string, Podcast> >();
PodcastItems = Enumerable.Empty <PodcastItem>();
PodcastSortItems = PodcastRepository.GetPodcastSortItems().Select(item => new SelectListItem {
Text = item.Name, Value = item.Value.ToString()
});
PodcastFilterItems = PodcastRepository.GetPodcastFilterItems().Select(item => new SelectListItem {
Text = item.Name, Value = item.Value.ToString()
});
}