Maintain Page scroll position when paging in ASP.Net DataList

HI every one i use pagination for my datalist according to this link

http://www.aspsnippets.com/Articles/Custom-Paging-in-ASP.Net-GridView-using-SQL-Server-Stored-Procedure.aspx

this is style of pagination

First 1,2,3,4,5 Last

when i run web site i see my datalist with pagination in webpage my datalist is middle of page when i click on page number 2 or 3 to see other page of datalist it reload page and go to top of page i should scroll untill i can see my datalist again.

i want when users click on page number after that they see other page of datalist dirrectly not top of page 

how i can do it?

thanks