public Book.info.Books Update(Book.info.Books update)
        {
            var query = Book.SingleOrDefault(r => r.Id == update.Id);

            if (update != null)
            {
                query.Id     = update.Id;
                query.Name   = update.Name;
                query.Price  = update.Price;
                query.Author = update.Author;
            }
            return(query);
        }
 public Book.info.Books Add(Book.info.Books added)
 {
     Book.Add(added);
     added.Id = Book.Max(r => r.Id) + 1;
     return(added);
 }