public static UserToBook CreateUserToBook(Guid userId, int bookId, int userToBookId)
        {
            UserToBook userToBook = new UserToBook()
            {
                UserId       = userId,
                BookId       = bookId,
                UserToBookId = userToBookId
            };

            return(userToBook);
        }
 public void AddToUserToBooks(UserToBook userToBook)
 {
     base.AddObject("UserToBooks", userToBook);
 }