public void OnBookAdded(object source, NewBookArgs new_book) { int index = collection.Count() + 1; new_book.Book.Id = index; Collection.Add(new_book.Book); model = new source_library(); model.insert_book(new_book.Book.Id, new_book.Book.Author, new_book.Book.Title, new_book.Book.Year); add_edit_view.Hide(); }