Add missing books to iTunes

gistfile1.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using iTunesLib;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            AddMissingBooksToItunes();
        }

        private static void AddMissingBooksToItunes()
        {
            var app = new iTunesApp();

            foreach (var missingBook in AvailableBooksNotInItunes())
            {
                app.LibraryPlaylist.AddFile(missingBook);
            }
        }

        private static IEnumerable<string> BooksInItunes()
        {
            var app = new iTunesApp();

            return app.LibraryPlaylist.Tracks
                .OfType<IITFileOrCDTrack>()
                .Where(track => track.Location.EndsWith("*.pdf"))
                .Select(track => track.Location);
        }

        private static string[] AvailbleBooks()
        {
            return Directory.GetFiles(@"C:\Users\timvw\Dropbox\ebooks", "*.pdf");
        }

        private static IEnumerable<string> AvailableBooksNotInItunes()
        {
            var availableBooks = AvailbleBooks();
            var booksInItunes = BooksInItunes().ToArray();
            return availableBooks.Where(book => !booksInItunes.Contains(book));
        }
    }
}