How to remember the current page no. on the datascoller?

I have a datagrid with the datascoller, the datagrid list out our product and has a commondlink in the cells for user to see detail, when user go to page 3 and click the link to view the product detail, and then return back to the list page, the pageindex is reset to 1, not the page 3.

How to handle this situation? Thanks