Sample

public function actionIndex()
{
    if(isset($_POST['caridata'])){
        $dataProvider = Registration::model()->search($_POST['caridata']);
    }else{
        $criteria=new CDbCriteria(array(
            'order'=>'id DESC'
        ));
        $dataProvider=new CActiveDataProvider('Freelance', array(
            'criteria'=>$criteria
        ));
    }
    $this->render('index',array(
            'dataProvider'=>$dataProvider,
        ));
}