Hi, Here is my scenario: I have 3 tables: Person, Agency and AgencyPerson to represent a m:m relationship. I populate a listbox with Person.AgencyPersons. Add a Agency to the collection using this code: Code Snippet AgencyPerson agencyPerson = new AgencyMemberNatPerson();agencyPerson.Agency = agency; agencyPerson.AgencyId = agency.Id; agencyPerson.PersonId = person.Id; agencyPerson.Person = person; to remove it, i simply remove it from the Person.AgencyPerson.Remove(...) Scenario: I add a agency,
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