wordpress query a post by id

1// Retrieve the ID of the current item in the WordPress Loop.
2get_the_ID()

1    $args=array(
2    'posts_per_page' => 50, 
3    'post_type' => 'my_custom_type'
4    'cat' => $cat_id,
5);
6$wp_query = new WP_Query( $args );
7

1//WordPress: Query a specific post by its post type & ID
2//For example, query Case Study with ID #12345
3
4<?php query_posts('post_type=case_studies&p=12345'); ?>
5  
6/*To determine a post ID, refer to the
7URL of the post while editing it:
8http://localhost...wp-admin/post.php?post=12345...*/