Hi Victoria,
The DateTimePicker does not support DBNull but you can subclass the control and add functionality to it to build in the support you are looking for. Here is a link to code. I have not tried this inherited control myself but knew that it existed:
http://www.smithvoice.com/dropcal.htm>How can I get rid of the default value (Todays Date) in datetimepicker control.
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Cathi Gero, CPA
Prenia Software & Consulting Services
Microsoft C# / .NET MVP
Mere Mortals for .NET MVP
cgero@prenia.comwww.prenia.comWeblog: blogs.prenia.com/cathi