Custom control in visual studio.net 2008

I am working on a C#.net 2008 windows form application. I want to keep the existing (gui) interface for the application. What I am doing is pointing a dropdown list to a different table. The current production table will be changing. The items that can be selected from the drop down list will not be changing. Can you tell me how I can setup (modify) the link (connection) so that when the user points to the new table, the dropdown list will point to the new table in a user control?