如何在gridview上取radio这行的值
<asp:GridView ID="GvData" runat="server" AutoGenerateColumns="False" BorderColor="#BBBBBB"
BorderWidth="1px" CssClass="tb" Width="600px">
<Columns>
<asp:TemplateField HeaderText="用户编号">
<ItemTemplate>
<asp:Label ID="userid" runat="server" Width="50px" Text='<%#Bind("userid") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="操作">
<ItemTemplate>
<asp:RadioButton ID="radButtonControl" GroupName="group1" runat="server" />
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
</Columns>
<EmptyDataRowStyle ForeColor="Red" HorizontalAlign="Center" />
</asp:GridView>