Code check: List current category post titles dynamically

When finished this should be able to run in the sidebar/ as widget.

The following code should work. What am I overlooking?

<h2><?php single_cat_title() ?></h2>

<?php
$categoryvariable=$cat; // assign the variable as current category
 $query= 'cat=' . $categoryvariable. '&orderby=date&order=ASC'; // concatenate the query
 query_posts($query); // run the query
if ($myposts):
foreach ($myposts as $post):
setup_postdata($post);
the_title();
endforeach;
else :
// Nothing Found
endif;
?>

Thank you