public Book RetrieveBookByID(int id)
        {
            Book bookDetail = null;

            try
            {
                bookDetail = BookAccessor.RetrieveBookByID(id);
            }
            catch (Exception)
            {
                throw;
            }

            return(bookDetail);
        }
        public Book RetrieveBookByID(Book bookItem)
        {
            Book bookDetail = null;

            try
            {
                bookDetail = BookAccessor.RetrieveBookByID(bookItem.BookID);
            }
            catch (Exception)
            {
                throw;
            }

            return(bookDetail);
        }