WP_Query with pagination in wp-admin pages (for plugin etc)

$paged = get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1;
$args = array(
            'posts_per_page'    => 5,
            'paged'         => $paged
         );

$custom_query = new WP_Query( $args );

// Output custom query loop
if ( $custom_query->have_posts() ) :
    while ( $custom_query->have_posts() ) :
        $custom_query->the_post();
        // Loop output goes here
    endwhile;
endif;
// Reset postdata
wp_reset_postdata();

//wp_query object is not available in wp-admin. so we need to design custom pagination
// Pagination
    $max_pages = $custom_query->max_num_pages;
    $nextpage = $paged + 1;
    $previouspage = $paged - 1;

    if ($max_pages > $paged) {
        echo '<a href="admin.php?page=plugin_page.php&paged='. $nextpage .'">Load More Posts</a>';
    }
    if ( $paged > 1 ) {
        echo '<a href="admin.php?page=plugin_page.php&&paged='. $previouspage .'">Load Previous Posts</a>';
    }