Gridview Paging

Question

Please Help me

I have one aspx page on that page drowpdown list is their based on value selected i want to populate my gridview And i want paging to be enabled on grid.

I'm getting data ,but on first page pages r shown as soon i click on the any other page , paging is getting disappered on  that page.I want pages to be displayed whether i'm on page 1 or page 9.

Based on the value seleced from dropdown i 'm selecting data from different datatables, so pls provide me eg. were store procedures r used.

thank u.