c# - RadioButtons are not mutually exclusive, despite same GroupName (ASP.NET) -

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i using listview, represents list of products 1 of them should chosen. in itemtemplate, gave radiobutton same groupname property in order them mutually exclusive. however, not work right of products can chosen @ once. doing wrong? thanks

<itemtemplate>   <li class="product" id='<%#eval("productid")%>'>     <asp:radiobutton groupname="products" id="radiobutton1" runat="server" />   </li> </itemtemplate>


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