Page templates not working

First: I’m from Holland, so I should speak good English, but I don’t. Sorry for the grammatical faults en using the wrong words and things.

I have a problem with using more page templates. I want more page templates to use on different pages.

I have page.php:

<?php
/*
Template Name: Page
*/
?>

<?php get_header(); ?>

<div id="content">

<div class="left">

<div class="pagina">

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class="post" id="post-<?php the_ID(); ?>">
<b><?php the_title(); ?></b>

<?php the_content('Lees meer »'); ?>

</div>

<?php comments_template(); ?>

<?php endwhile; endif; ?>

</div>

<div class="right">

hjhjh

</div>

</div>

<?php get_footer(); ?>

And I have cast.php:


<?php
/*
Template Name: Cast
*/
?>

<?php get_header(); ?>

<div id="content">

<div class="left">

<div class="pagina">

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
<div class="post" id="post-<?php the_ID(); ?>">
<b><?php the_title(); ?></b>

<?php the_content('Lees meer »'); ?>

</div>

<?php comments_template(); ?>

<?php endwhile; endif; ?>

</div>

<div class="right">

hjhjh

</div>

</div>

<?php get_footer(); ?>

Looks fine to me, but it’s not working. If I write or edit a page I can’t find the option.

What am I doing wrong?