Generate Row Number for CgridView in YII

Yii::CGridView – Generate row number

<code>$this->widget(  'zii.widgets.grid.CGridView',  array(    'columns'=>array(      array(        'header'=>'No.',        'value'=>'$this->grid->dataProvider->pagination->currentPage * $this->grid->dataProvider->pagination->pageSize + ($row+1)',      ),
      'emp_no',
      'emp_name',
    ),  ));</code>