I have several fields in my table of type System.Int32 and they are allowed to be null. I want to put a NULL value (not a 0) in the database table when the user empties a textbox (bound to the BO).

I already read the posts about this solution using String.Empty but thats not working for me... Also, I tried to use nullable generics in the datamapper but then, when the user empties the textbox, the new (empty) value isn't saved to the BO (the old value remains)

This can't be that difficult, am I right?