public function actionAddproductfile()
    {
        if(isset($_POST["Filedata"]) && Yii::app->request->isAjaxRequest)
        {
            $model=new ShopProductFile(); //lazy initiation
            $model->product_id=$_POST['pid'];
            $model->file=$_POST('Filedata');
            if ($model->validate) {
                $model()->save();
                echo 'Data saved!';
            } else {
                echo 'Error!';
            }
        } else {
            $data=ShopProducts::model()->with('category','shopImages')->findByPk($_GET['id']);
            $this->contentTitle="Upload Product File: {$data->category->title}";
            $this->render('addproductfile', array('data'=>$data, 'model'=>$model));
        }
     }