Sir;
What I understood that you have to make sure that at least one check box is checked when a certain value is selected in the radio list.
so, you need to add a custom validator with client validation function of
function ValidateItemCheck(sender, e){
var selectedoption = $("input[id^='<%= radiolist.ClientID %>_']:checked");
if (selectedoption.val() == 'somevalue') {
var gridview = $('#<%= gridview.ClientID %>');
e.IsValid = (gridview.find('input[type=checkbox]:checed').length > 0)
}
else
e.IsValid = true;
}
for more information about CustomValidator please refer to
http://asp.net-tutorials.com/validation/custom-validator/[
^]