private void TryUpdateBook(IUnitOfWork uow, int seriesID, List <Book> oldBooks, BookUpdate newBook)
{
var oldBook = oldBooks.SingleOrDefault(c => c.SourceItemID == newBook.SourceItemID);
if (oldBook == null)
{
AddNewBook(uow, seriesID, newBook);
}
else
{
UpdateBook(oldBook, newBook);
}
}