Radio buttons in a datagrid

[mendhak]

I've added radio buttons to a templatecolumn in a datagrid like so:

<asp:TemplateColumn HeaderText="Sel. One" ItemStyle-HorizontalAlign="Center">
	<HeaderStyle Width="0%">
	</HeaderStyle>
	<ItemTemplate> 
		<input type="radio" name="rdSelect" id="rdSelect" runat="server">
	</ItemTemplate>
</asp:TemplateColumn>

Once the datagrid is populated, the radio column does show up, but I am able to select all radio buttons. What should I do to allow the selection of just one radio button?