show message on selectedindexchange

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ASP.NET

Hi
i have a Listview and DataPager.
also i have checkbox onselectedindexchange in which i filter a datatable..and display in listview.

so for exp, i have 100 records in listview, in DataPager1_PreRender and page_load , i do as

ProductList.DataSource = datatablename;
ProductList.DataBind();

and when checkbox event (onselectedindexchange) called, i filter datatable and show 50 records (for exp) .. so in listview i show now 50 records.

So when filtering for records is going on , i want to show user message that work is going on

same like makemytrip filtering for hotels.

How to do this