private Reservation ReadReservation(SqlDataReader reader)
{
int id = (int)reader["Id"];
int customerId = (int)reader["CustomerId"];
int bookId = (int)reader["BookId"];
CustomerDAO customerDAO = new CustomerDAO();
Customer customer = customerDAO.GetById(customerId);
BookDAO bookDAO = new BookDAO();
Book book = bookDAO.GetById(bookId);
return(new Reservation(id, customer, book));
}