asp.net changes the method of gridview pageSize

There are three ways to do this
1. In view

 
<span style="color:#000000;">$provider=$model->search(); 
$provider->pagination->pageSize=20; 
$this->widget('zii.widgets.grid.CGridView', array( 
'id'=>'link-grid', 
'dataProvider'=>$provider,</span> 

2. In model's search method

 
return new CActiveDataProvider(get_class($this), array( 
'criteria'=>$criteria, 
'pagination'=>array( 
'pageSize'=> 5, 
), 
)); 

3. In controller

 
$dataProvider=new CActiveDataProvider('Post', array( 
'pagination'=>array( 
'pageSize'=>Yii::app()->params['postsPerPage'], 
), 
'criteria'=>$criteria, 
));