Below example showing you how to add the row number in cgridview widgets.
You just need add the following script inside the array columns.
array( 'header' => 'No.', 'value' => '$this->grid->dataProvider->pagination->currentPage * $this->grid->dataProvider->pagination->pageSize + ($row+1)', ),
The completed example as below:
$this->widget('zii.widgets.grid.CGridView', array( 'id' => 'grid-row-number', 'dataProvider' => $model->search(), 'filter' => $model, 'columns' => array( array( 'header' => 'No.', 'value' => '$this->grid->dataProvider->pagination->currentPage * $this->grid->dataProvider->pagination->pageSize + ($row+1)', ), 'name', 'create_time' ) ));