filtered table in listview and datepage

I fill listview from datatable..
then when checkbox clicked , i i filter table and fill listview again with filtered table values

also i use datepage i.e.   DataPager1_PreRender  
and i show 25 products in each page
so that when 2 clicked in navigation , 2 is highlghted and records 26 to 50  are shown
when 5 clicked . records from 100 to 125 are shown

and so on

but when i filter table .. it shows table row count as original and not new filtered table row count
i tired to put filtered table in datapager prerender , but it takkes original table count
how to make it take filtered table count when filter applied and whenfiltered remove, take original table count

pls advice