I have what I consider to be an unusual issue. In the past, I've not used
data-binding with the DTPs. So I'm finding some of the old issues raising
their ugly heads in a new fashion.

First a caveat: All other controls and data work properly on this form.
Updates, deletes, inserts, all as advertised. The DTPs are bound to
smalldatetime columns in the database. The bindingsource is bound to the
table, the controls to the bindingsource.

The DTPs are set up as follows:
 ShowCheckBox = True
 Checked = True
 Format = Short

My understanding of the DTP in the past has been that an unchecked control
indicates a null. In the past, when I manually saved the values from the
DTPs, I could save a null back to the database. But now, when I uncheck a
DTP and save, the originally saved date remains in the database. If I change
the value in the DTP (even if unchecked), the value in the database changes.

So what gives with the binding? How in the world to null a value from the
DTP when it is bound? Finally, who created this godforsaken control!?