So By using below code you can find, which radio button is checked in radiobuttonlist
jQuery('#ctl00_ContentPlaceHolder1_rblSort input:radio:checked').val()
or
$("#ctl00$ContentPlaceHolder1$rblSort").data("currChecked",
$(this).find("input:radio:checked")[0]);
Hope this post will help you,
if yes please put comment below of this page,
Rajesh Singh,
Senior Asp.Net Developer
Email: raj143svmit@gmail.com
e-Procurement Technologies Ltd (India)
www.abcprocure.com