How do I change the order (ASC and DESC) in the following retrieval method using WP_Query?

just change this line in your code:

 $posts = new WP_Query('post_type=page_content&page_sections=Slider (Front Page)') ?>

to this:

 $posts = new WP_Query('post_type=page_content&page_sections=Slider (Front Page)&order=ASC') ?>

Basically it adds the order parameter witch can take two values (ASC,DESC).

hope this helps.

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