cypher_jy: Its compulsory for the user to select only 1RB from the 1st column and only 1RB from the 2nd column, plus the user can only select 1RB per row.
You can use JavaScript to validate.. here's an example for your reference:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript" language="javascript">
function Validate(obj1, obj2)
{
var box1 = document.getElementById(obj1);
var box2 = document.getElementById(obj2);
if(box1.checked == true)
{
box2.checked = false;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:RadioButton ID="RadioButton1" runat="server" GroupName="demoGroup" onclick="Validate('RadioButton1','RadioButton4');"
Text="Test1" />
<asp:RadioButton ID="RadioButton4" runat="server" GroupName="demoGroup1" onclick="Validate('RadioButton4','RadioButton1');"
Text="Test4" />
<br />
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="demoGroup" onclick="Validate('RadioButton2','RadioButton5');"
Text="Test2" />
<asp:RadioButton ID="RadioButton5" runat="server" GroupName="demoGroup1" onclick="Validate('RadioButton5','RadioButton2');"
Text="Test5" />
<br />
<asp:RadioButton ID="RadioButton3" runat="server" GroupName="demoGroup" onclick="Validate('RadioButton3','RadioButton6');"
Text="Test3" />
<asp:RadioButton ID="RadioButton6" runat="server" GroupName="demoGroup1" onclick="Validate('RadioButton6','RadioButton3');"
Text="Test6" />
<br />
</div>
</form>
</body>
</html>