I am trying to edit a recurrence appointment programmly. But I can't make an exception recurrence appointment link to master appointment with " RecurrenceParentID " property, it can't bee saved when I insert the new created exception recurrence appointment. I have checked that the master's exception rule has been updated correctly and the new exception appointment's "RecurrenceParentID" property has been set correctly, but it can't bee saved to xml file ( I am using xml provider ). So please help me . Thank you very much .