Say I have a ComboBox, which comes from a BO, and available values are A,B,C,D. If Ichange the selection from say A to B, everything is ok and the B is saved back to the database.

If there was an A in the value and I enter  X into the combobox(i.e. a value that is not in the Dropdown), when the record is saved, the value that is saved is A (Not the X). I noticed this when I was building a validation routine , and if I enter an X, I cant seem to trap this anywhere (I want to add the fact thet an X was entered into the BrokenRules). Its ok that the X is not written away , as it would not be a valid entry anyway, but I am having a problem in that the Business Object still has th 'A' in there insted of the 'X', and I want to let the user know that they have typed in an 'X', otherwsie they will continue on and think that the 'X' has been accepted.