I have a radibutton list.

          <asp:RadioButtonList ID=RadioButtonList1 runat=server 

              RepeatDirection=Horizontal RepeatLayout=flow >

             <asp:ListItem Selected=True Text =Yes Value=0></asp:ListItem>

             <asp:ListItem  Text =No Value=1></asp:ListItem>

          </asp:RadioButtonList>

And to get the value from radio list I have a function :

 function getvalueofradiolist() {



        var radiolist = document.getElementById('<%= RadioButtonList1.ClientID %>');

        var rblName = radiolist.name;

        var radio = document.getElementsByName(rblName);



        for (var x = 0; x < radio.length; x++) {

            if (radio[x].checked) {

                alert(Selected item Value  + radio[x].value);

            }

        }

    }

But it returns undefined.

Did I write something wrong?

I am calling this function on button click.

Suggest me If I can do this with the help of code behind in spite of Javascript.