I have a bound combo to a SQL Server tinyint field and a list of items to chose from populated by setting the databindings to a dataview with a tinyint value field and string display field. 

Selecting an item in the list is firing the ItemNotInList event though.  Very weird:  in the event, capturing the value field shows the correct new value and after the event , the focus changes and the dataset isupdated with the correct value.  If I select the previously chosed value (that is, the value of the bound record), then the event does not fire.

If indeed I do type an invalid value, the event shows the bad text as the value, the old value is restored, and the dataset is not updated.