E.R.,

>The table this is saving to has a date field that accepts nulls. I'm editing the row that had a null date to begin with. After editing a field (not the date field in question) I get the ArgumentException while trying to update. I tried checking the date field before saving and setting it to System.DBNull.Value, but that doesn't work.

I recommend setting a breakpoint in mmGridView.BindBack() to see exactly what's going on.

Best Regards,