public static void Add(Downloadable item)
 {
     AddAll(new List <Downloadable>()
     {
         item
     });
 }
 private static DownloadableRow downloadable2row(Downloadable item)
 {
     return(new DownloadableRow {
         Uri = item.Source.OriginalString,
         Destination = item.Destination
     });
 }