<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<input type="radio" name="CarGroup" id="<%#"rbCar" + (Car)Container.DataItem.ID %>" value="<%#(Car)Container.DataItem.ID %>" runat="server" /><label for="<%#"rbCar" + (Car)Container.DataItem.ID %>">"<%#(Car)Container.DataItem.CarName %>"</label>
</ItemTemplate>
</asp:Repeater>
...
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