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I have a table T with fields id, parentid, name. i make relationship with own table so parentid=>id one to many, so if parentid=null it is a parent record, and if parentid not null it is child record.
After mapping I have class with 2 new properties- T1 (Collection of T) and T2 (Instance of T)
How can I fill dropdownlistfor if I don’t have field parentid filled?
You should use the ID field for the DataValueField. That way it’s always unique… or am I missing something?