add yesno field in admin grid

this is way to add dropdown / select field in magento admin grid

file path : app\code\local\Module_Name\Company_Name\Block\Adminhtml\block_name\Grid.php

$yesnoOptions = array('0' => 'No','1' => 'Yes','' => 'No');

 $this->addColumn('is_vendor', array(

           'header'    => Mage::helper('customer')->__('Is Vendor'),

           'index'     => 'is_vendor',

'type'      => 'options',

'options'   => $yesnoOptions,

       ));