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When user open any post, then on the right side they can see related posts to that post. But currently in related posts my current open post also showing, how i can exclude that post which is currently open.

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Use the parameter 'post__not_in' to exclude post IDs:

$posts = new WP_Query(
    array (
        'post__not_in' => get_the_ID() // exclude current post ID
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Use the source in a plugin, about the hook pre_get_posts is sure the best way. – bueltge Mar 13 '13 at 11:41

If you could give us some code snippets of what you are currently using, it would help us formulate an answer. Unfortunately I don't have enough reputation to say this as a comment on the OP, so I will provide my answer based on the knowledge provided in the OP.

When loading the current post (presumably by using single.php), you can save the post ID in a PHP variable, like so:

<?php $do_not_duplicate = $post->ID; ?>

Later, in your loop to display related posts, you need an if-statement to skip the loop if the ID's match. Like so:

    // Get related posts
    $related = new WP_Query( $args );
    while ( $related->have_posts() ) : $related->the_post();
        if (in_array($post->ID, $do_not_duplicate)) continue;
<!-- Your html for related post listing -->
    endwhile;           // End 'while have_posts()'
    wp_reset_postdata();    // Reset Post Data
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<?php $args=array( 'category_name' => $catname, 'post_type' => 'post', 'post_status' => 'publish', 'posts_per_page' => 12, 'caller_get_posts'=> 1 ); $my_query = null; $my_query = new WP_Query($args); if( $my_query->have_posts() ) { while ($my_query->have_posts()) : $my_query->the_post(); ?> – Adi Mar 13 '13 at 11:16
@Adi Please(!) always update/edit your question with additional information. Don't write comments for that. A comment should be "Hey, I added the info :)" or similar. – kaiser Mar 13 '13 at 12:13
@MarcDingena If you need clarification of the question, please leave a comment at the question requesting additional Info. Thanks. – kaiser Mar 13 '13 at 12:14
@kaiser next time i be carefull about that. But i want to know one thing how i make my code in a block. The short code provide is not working in my comments. See my above commment how it look. – Adi Mar 13 '13 at 12:18
@kaiser I can't do that because I don't have 50 reputation yet. – Marc Dingena Mar 13 '13 at 12:24

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