How to add a ASP:NET DropDownList programmatically in C#

So I've got a masterpage on which a DropDownList should be displayed. Then I've got a class which should create a DropDownList. But since I've only got one page with a DDL I don't want to write inside the masterpage.aspx. So my question is if it is even possible to write all the code inside C# to create the DropDownList. Do I need someting like that?
<asp:Panel ID="pnlChannel" runat="server"> or can I jus ...