if user is in the admin role then show the admin menu option

When user opens Web Application (C# ASP.Net 4.0) if user is in the admin role then show the admin menu option, if not in the admin role do not show the admin menu option.
In my Web.config file
<authentication mode="Windows" /> <authorization> <allow roles="MyDomain\User, MyDomain\Admin" /> <deny users="*" /> </authorization>
In my web page,
<asp:Menu ID="Menu1"> <Items> <asp:MenuItem Text="User Menu" Value="User Menu"> <asp:MenuItem Text="Edit Data" Value="Edit Data"></asp:MenuItem> <asp:MenuItem Text="Process Data" Value="Process Data"></asp:MenuItem> </asp:MenuItem> <asp:MenuItem Text="Admin Menu" Value="Admin Menu"> <asp:MenuItem Text="Codes" Value="Codes"></asp:M ...