Auto Generate serial number in Repeater Control in paging

Hi,

I am using repeater control for display certain data. I am trying to auto generate serial number in customized paging (using PagedDataSource class) in repeater control but not able to do so.
I have used <%#Container.ItemIndex + 1%> in serial number column but it does not work while paging as it repeats number in page change.

Please help.

Regards,
Ashutosh