please give me php code for magento

C:xampphtdocsmappcodelocalPkmoduleRewardBlockAdminhtmlRewardGrid.php

<?php class Pkmodule_Reward_Block_Adminhtml_Reward_Grid extends Mage_Adminhtml_Block_Widget_Grid { public function __construct() { parent::__construct(); $this->setId(“rewardGrid”);<br /> $this->setDefaultSort(“id”);<br /> $this->setDefaultDir(“ASC”);<br /> $this->setSaveParametersInSession(true);<br /> }</p> <p> protected function _prepareCollection()<br /> {<br /> $collection = Mage::getModel(“reward/reward”)->getCollection();<br /> $this->setCollection($collection);<br /> return parent::_prepareCollection();<br /> }<br /> protected function _prepareColumns()<br /> {</p> <p> $groups = array(“value”,”puneet”,”kumar”);</p> <p> $this->addColumn(“id”, array(<br /> “header” => Mage::helper(“reward”)->__(“ID”),<br /> “align” =>”right”,<br /> “width” => “50px”,<br /> “type” => “number”,<br /> “index” => “id”,<br /> ));</p> <p> $this->addColumn(“name”, array(<br /> “header” => Mage::helper(“reward”)->__(“NAME”),<br /> “align” =>”left”,<br /> “width” => “50px”,<br /> “type” => “options”,<br /> ‘options’ => $groups,<br /> “index” => “name”,<br /> ));</p> <p> $this->addColumn(“order”, array(<br /> “header” => Mage::helper(“reward”)->__(“order”),<br /> “align” =>”left”,<br /> “width” => “50px”,<br /> “type” => “options”,<br /> ‘options’ => $groups,<br /> “index” => “order”,<br /> ));</p> <p> $this->addRssList(‘reward/adminhtml_rss_rss/reward’, Mage::helper(‘reward’)->__(‘RSS’));<br /> $this->addExportType(‘*/*/exportCsv’, Mage::helper(‘sales’)->__(‘CSV’));<br /> $this->addExportType(‘*/*/exportExcel’, Mage::helper(‘sales’)->__(‘Excel’));</p> <p> return parent::_prepareColumns();<br /> }</p> <p> public function getRowUrl($row)<br /> {<br /> return $this->getUrl(“*/*/edit”, array(“id” => $row->getId()));<br /> }</p> <p> protected function _prepareMassaction()<br /> {<br /> $this->setMassactionIdField(‘id’);<br /> $this->getMassactionBlock()->setFormFieldName(‘ids’);<br /> $this->getMassactionBlock()->setUseSelectAll(true);<br /> $this->getMassactionBlock()->addItem(‘remove_reward’, array(<br /> ‘label’=> Mage::helper(‘reward’)->__(‘Remove Reward’),<br /> ‘url’ => $this->getUrl(‘*/adminhtml_reward/massRemove’),<br /> ‘confirm’ => Mage::helper(‘reward’)->__(‘Are you sure?’)<br /> ));<br /> return $this;<br /> }</p> <p>}<br />

magen i add new $this->addColumn for filter but value not showing ?