Have you bound the ID values to another object as you bound the Name values to a dropdown list?
If not, perhaps you could bind the ID values to a list box or a dropdown list, and make the list box or dropdown list hidden so it does not render in the form. When a Name is chosen from the dropdown list, you could extract the ID from the list box or dropdown list based upon its relative position, given an ID exists for each Name and a Name exists for each ID.
Steve