private static void SaveDefaultValues()
 {
     BinBookRepozitory rep = new BinBookRepozitory(fileName);
     List<Book> listOfBook = new List<Book>();
     Book first = new Book("Author1", "Title1", "Pub1", 1990, 200);
     Book second = new Book("Author2", "Title2", "Pub1", 1999, 250);
     Book third = new Book("Author3", "Title3", "Pub1", 1998, 205);                 
     listOfBook.Add(first);
     listOfBook.Add(second);
     listOfBook.Add(third);
     rep.Save(listOfBook);
     
 }
 static void Main(string[] args)
 {
     try
     {
         BinBookRepozitory rep = new BinBookRepozitory(fileName);
         SaveDefaultValues();
         BookListService bls = new BookListService(rep);             
         Book[] find = bls.FindByTag("1999", EnumTag.Year); 
         foreach (Book b in find)
         Console.WriteLine(b);
         Console.WriteLine("-------------------------");
         Book[] sort = bls.SortBooksByTag(EnumTag.Page);
         foreach (Book b in sort)
             Console.WriteLine(b);
         //bls.AddBook(sort[0]); 
         bls.RemoveBook(sort[0]);
         bls.RemoveBook(sort[0]);
     }
     catch (Exception e)
     {
         Console.WriteLine(e.Message);
     }
     
 }