how to use checkbox in datalist without select btn

hi all

i need help in this Scenario for use checkbox in datalist .

if i checked any checkbox in datalist will display in label or what ever you want

on other mean if i checked directly i see result in label then if checked another the result extend in that label.

i know how to use checkbox in datalist but with buttn click or select btn .

i do not need use any btn .

i know this case with button click or select link .

DataSourceID="SqlDataSource1"> person_no: person_name: Country_no: Text='<%# Eval("Country_no") %>' /> label
SelectCommand="SELECT top(3) * FROM [anytable]">