I think this is a really simple question.... but I don't know enough about .NET to be able to figure out my own answer.  I am converting some data from FoxPro to .Net and SQL Server.  Well the old FoxPro system had a ZipCode table, just so happens that the table doesn't have all the zip + 4 zipcodes.  In some of the client information data (different table, like a patient table or something) they have the zip + 4 codes entered... If I have a combobox based on the zipcode table (and it dosen't have the + 4 stuff) how do I get the system to display the information for the user if it is NOT contained in the data?  Right now I just get a blank combobox.

I understand that the combo doesn't show anything if it doesn't find a matching value in it's data (doesn't the native .Net combo allow this), but this is something that I could do in FoxPro (I know..... I hate bringing that up but that is the way my mind is working.... I need to start thinking .NET).

Any and ALL help will be appreciated...  even if it is "it doesn't work that way, get a better conversion routine".

Scott