Access session in model or some other model in CakePHP model

Some times there is requirement to access session in cakephp Model.So to access the session we use this:

Example:

In cakePHP 2.3

App::uses('CakeSession', 'Model/Datasource');
$selected_lang = CakeSession::read('Auth.User.lang_id');

In cakePHP 1.3:

 App::import('Component', 'SessionComponent');
  $session = new SessionComponent();
 To access other model we use like:
 App::import('Model', 'UserDpAssociation');
 $this->UserDpAssociation =& new UserDpAssociation();