
<html>
<body>

<form runat="server">
<asp:RadioButtonList runat="server">
<asp:ListItem Text="Item1" />
<asp:ListItem Text="Item2" />
<asp:ListItem Text="Item3" />
<asp:ListItem Text="Item4" selected="True"/>
</asp:RadioButtonList>
</form>

</body>
</html>