public function actionIndex() {
    $model=new TbState('search');
    $model->unsetAttributes();
    if(isset($_GET['TbState']))
        $model->attributes = $_GET['TbState'];
    if(isset($_GET['countryid'])
        $model->countryid = $_GET['countryid'];
    $this->render('index',array(
        'model'=>$model,
    ));
}
/////////////////////////////////
public function search() {
// Warning: Please modify the following code to remove attributes that
// should not be searched.
    $criteria=new CDbCriteria;
    $criteria->compare('stateid',$this->stateid);
    $criteria->compare('state',$this->state,true);
    $criteria->compare('countryid',$this->countryid);

    return new CActiveDataProvider($this, array(
    'criteria'=>$criteria,
    ));
}