HELP MY!!! radioButton on GridView select only one C#

Question

Hello friends, I need to add radiobutton in a gridview, but only need to select one, the rows are added from a webservice, not hard data, the language is C #, need help please. thanks

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hola amigos, necesito agregar radiobutton en un gridview, pero solo se debe seleccionar uno, las filas se agregan desde un webservice, no son datos en duro, el lenguaje es en C#, porfavor necesito ayuda. gracias

 

  

<asp:GridView ID="gvPrecioNormal" runat="server" GridLines=">
  <Columns>
      <asp:TemplateField>
          <ItemTemplate>
            <asp:RadioButton ID="RadioButton1" runat="server" AutoPostBack="true" GroupName="RadioGroup"/>
          </ItemTemplate>
          <ItemStyle BorderWidth="1px" Width="5%" />
      </asp:TemplateField>
   </Columns>
</asp:GridView>

(  GroupName="RadioGroup" ) does not function whit gridview.