magento admin order filter by country

please give me php code for magento

C:\xampp\htdocs\m\app\code\local\Pkmodule\Reward\Block\Adminhtml\Reward\Grid.php

<?php

class Pkmodule_Reward_Block_Adminhtml_Reward_Grid extends Mage_Adminhtml_Block_Widget_Grid
{

public function __construct()
  {
    parent::__construct();
    $this->setId("rewardGrid");
    $this->setDefaultSort("id");
    $this->setDefaultDir("ASC");
    $this->setSaveParametersInSession(true);
  }

protected function _prepareCollection()
  {
    $collection = Mage::getModel("reward/reward")->getCollection();
    $this->setCollection($collection);
    return parent::_prepareCollection();
  }
  protected function _prepareColumns()
  {
  
  $groups = array("value","puneet","kumar");
  
  
    $this->addColumn("id", array(
    "header" => Mage::helper("reward")->__("ID"),
    "align" =>"right",
    "width" => "50px",
       "type" => "number",
    "index" => "id",
    ));
    
    $this->addColumn("name", array(
    "header" => Mage::helper("reward")->__("NAME"),
    "align" =>"left",
    "width" => "50px",
       "type" => "options",
    'options' => $groups,
    "index" => "name",
    ));
    
    $this->addColumn("order", array(
    "header" => Mage::helper("reward")->__("order"),
    "align" =>"left",
    "width" => "50px",
       "type" => "options",
    'options' => $groups,
    "index" => "order",
    ));
                    
   $this->addRssList('reward/adminhtml_rss_rss/reward', Mage::helper('reward')->__('RSS'));
   $this->addExportType('*/*/exportCsv', Mage::helper('sales')->__('CSV')); 
   $this->addExportType('*/*/exportExcel', Mage::helper('sales')->__('Excel'));

return parent::_prepareColumns();
  }

public function getRowUrl($row)
  {
      return $this->getUrl("*/*/edit", array("id" => $row->getId()));
  }

protected function _prepareMassaction()
  {
   $this->setMassactionIdField('id');
   $this->getMassactionBlock()->setFormFieldName('ids');
   $this->getMassactionBlock()->setUseSelectAll(true);
   $this->getMassactionBlock()->addItem('remove_reward', array(
      'label'=> Mage::helper('reward')->__('Remove Reward'),
      'url'  => $this->getUrl('*/adminhtml_reward/massRemove'),
      'confirm' => Mage::helper('reward')->__('Are you sure?')
    ));
   return $this;
  }

}

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