Gridview refreshing

Question

In my datagrid, I have a link called view details. This link is within the datagrid to view the details of each product.
When the user clicks on the link it will take the user to a page called 'viewdetails.aspx' and display the details of that particular product.
I have a back button in viewdetails.aspx to come back to the same page (search.aspx) where the datagrid is showing the result of the other products.
When the user comes back the datagrid becomes empty. I want the search result to remain in the datagrid. Then only the user can see the other products.
How can I do this? I am using objectdatasource to display the search results in the datagrid.