How to ensure users have selected radiobutton

For some reasons the asp.net server control radiobutton is not suitable inside Gridview so I use HTML radiobutton instead
<asp:TemplateField HeaderText="" SortExpression="ID">                                          <ItemTemplate>                         <input name="MyRadioButton" type="radio" value='<%# Eval("ID") %>' />         </ItemTemplate>                       </asp:TemplateField>
How to ensure user has selected at ...