Issue in validation

Hi all,

I am facing issue in displaying error message for validation.
I have added following code in model

var $validate = array(
'product_name' => VALID_NOT_EMPTY
);

and following code in view file i.e. add.thtml

<?php echo $form->input('product_name', array('size' => '15', 'name'
=> 'product_name', 'error' => false)); ?></td>
<?php echo $form->error('<table_name>.product_name', 'Please enter
product name'); ?>

But it is not displaying error message. Can anybody help me? Do we
need to modify controller also for validation?
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