How do I make the comment disappear after deleting from the database?

I can delete the comment from the database with this code, however when the page is loaded again the comment will still be there. I need to update again to disappear.
How do I resolve this?

            <?php if( 'POST' == $_SERVER['REQUEST_METHOD'] ) {
                set_query_var( 'commentid1', $_POST['commentid'] );
                wp_delete_comment( get_query_var( 'commentid1'), true );    
            };
            ?>
            <form class="delete-comment" action="" method="post">
               <input type="hidden" name="commentid" value="<?php comment_ID() ?>" /> 
                <p align="right">
                    <input type="submit" value="Delete" title="Delete" />
                </p>
            </form>