Clone dropdownlist dynamically

I have this dropdownlist:
<!-- lista dropdown de perguntas / dropdownlist for questions --> 'select a question Escolha uma pergunta: <asp:DropDownList id="ddlCampos" Width="200px" Runat="server" Height="20px" DataSourceID="SqlDataSource1" DataTextField="DES" DataValueField="DES" AppendDataBoundItems="True" AutoPostBack="True"></asp:DropDownList> <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>" ProviderName="<%$ ConnectionStrings:ConnectionString2.ProviderName %>" SelectCommand="SELECT [DES] FROM [PERGUNTA]"></asp:SqlDataSource> My question is: How to clone, in front of this very ddl, this exactly ddl but change the id, increasing  a number, i ...