Drupal Form:want to show previous form value as default_value on page

Question

My Goal is if user is submitting this form with \"Product Name\" value as \"YYY\". On submit page should reload but this time \"Product Name\" should show previous valye as

Answer 1

Drupal will do this by default if you include:

$formproductname['#redirect'] = FALSE;

In your $formproductname array.