YII set and get flush message

In controller: 

Yii::app()->user->setFlash(
    'Message00', //a string for key usage
    'This is msg from controller.'
);

In view: 

if(Yii::app()->user->hasFlash('Message00')){
    echo '<div class="flash-success">';
    echo Yii::app()->user->getFlash('Message00');
    echo '</div>'; 

}