Validation for Dynamically Created Radio button control

Hi All,
I am creating radiobutton dynamically for my Quiz application. Its not a radio button list, its just a radiobutton with segregated by groups.
Please find the dynamically created radiobuttons aspx Code for 2 questions:
<asp:radiobutton Text="1" ID="radiobutton1" groupName="mygroup1" runat="server" />
<asp:radiobutton Text="2" ID="radiobutton2" groupName="mygroup1" runat="server" />
<asp:radiobutton Text="Ashiq" ID="radiobutton3" groupName="mygroup2" runat="server" />
<asp:radiobutton Text="Faleel" ID="radiobutton7" groupName="mygroup2" runat="server" />
I need to achieve validation for the above dynamically. Please help
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