some we want to show the serailNo on cgridview .

$this->widget('zii.widgets.grid.CGridView', array(
  
    'dataProvider'=>$model->search(),
    'filter'=>$model,
    'columns'=>array(
        array(
            'header'=>'Sr #',
            'value'=>'$this->grid->dataProvider->pagination->currentPage * $this->grid->dataProvider->pagination->pageSize + ($row+1)',
        ),
       ............
));