Hi LAMarrano,
How did you "drop" your user control?
If you want to use Drag-and -drop in the VS2005, then you should drag that user control on to the design view of the IDE but not the source view. In this way the corresponding codes will get generated automatically for you.
Also, you can do this all manully. By writing something like this on your .aspx file.
<%@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %>
<uc1:WebUserControl ID="WebUserControl1" runat="server" />
Regards,
Ivan.