How can you show the posts of related category in wordpress?

With the help of following line of code we can show posts of related category:

     <?php query_posts("showposts=1&category_name=xyz&order=ASC/DESC"); ?>

         <?php if (have_posts()) : while (have_posts()) : the_post(); ?>

              <?php the_title(); ?>

              <?php the_content(); ?>

     <?php endwhile; ?>

     <?php endif; ?>

    <?php wp_reset_query(); ?>