public function actionGetDataStudent()
    {
        if(isset($_POST['Search']) && Yii::app()->request->isAjaxRequest)
        {
            /* condition check student_class, lesson_id, teacher_number */
            $model=new Achievement;
            $modelTestSchedule = new TestSchedule;
            $dataProviders = new CActiveDataProvider('StudentsClass',
                array(
                    'criteria'=>array(
                        'condition'=>'student_class =:student_class',
                        'params'=>array(':student_class'=>$_POST['Search']['class'])
                    ),
                    'pagination'=>array(
                        'pageSize'=>60,
                    ),

                )
            );

            $dataProvider = $dataProviders->getData();

            /* for output as html */
            if($dataProvider == NULL)
            {
                $this->renderPartial('_form_null');
            }
            else
            {
                $model->result_value = '0.00';
                $this->renderPartial('_form_student_result',array('dataProvider'=>$dataProvider,'dataProviders'=>$dataProviders,'model'=>$model,'modelTestSchedule'=>$modelTestSchedule));
            }
        }

    }