You can do it using JQuery. Below is what I did:
<script type="text/javascript" src="jquery-1.6.js"></script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script type="text/javascript" language="javascript">
function SelectRBTN(chk)
{
$('#<%=dataList.ClientID %>').find("input:checkbox").each(function() {
if (this == chk && this.value == 'on') {
$(this).parent('td').children('input:radio').attr('disabled', '');
}
});
}
</script>
</head>
<body >
<form id="form1" runat="server">
<asp:DataList ID="dataList" runat="server"
onitemcreated="dataList_ItemCreated" >
<ItemTemplate>
<asp:CheckBox ID="chk" runat="server" onclick="javascript:SelectRBTN(this);"/>
<asp:RadioButton ID="rbtn1" runat="server" enabled="false" />
<asp:RadioButton ID="rbtn2" runat="server" enabled="false" />
<%#Eval("Name") %>
<%#Eval("Roll")%>
</ItemTemplate>
</asp:DataList>
</form>
</body>
</html>
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