Redirect from one controller to product page in magento

While I was working on a module , it was required to redirect to a particular page,I tried to using header(‘location’)… .But it was not worked,So I searched in net How to redirect from a controller to product page, No solution Found .i tried myself and got a solution ,Which I am posting here.

In my controller i was sending the product Id and After doing some work I need to redirect to that product page.

I got this solution and worked.

$obj = Mage::getModel('catalog/product');
$_product = $obj->load($productId);