listview in web method in asp.net

In webmethod , i try as


DataTable dttemp_temp = (DataTable)HttpContext.Current.Session["SearchHotel"];

StringBuilder filter = new StringBuilder();
DataView dv = new DataView(dttemp_temp);

filter.Append(" rating_temp = '5'");

dv.RowFilter = filter.ToString();

dttemp_temp = dv.ToTable();

int rcnt_temp = dttemp_temp.Rows.Count;


ProductListList.DataSource = dttemp_temp;
ProductListList.DataBind();

waiting.....
or u suggest what is best way... but first of all , did u understand where i m stuck,,
for exp..u can see makemytrip.com, where when we search hotels,and get list of hotels, then when we use filters, it shows filtered list without page refresh