Explicitly delete records by calling the Delete method. There are methods to delete by object, by primary key, by passed parameters. To do a delete of the object with the children, see Deleting with Children.
'Get the current instance of the helper
Dim db As IDataHelper = DataHelper.SessionFactory()
'Create a new Person to save to the database Dim
currentPerson.FirstName = "John"
currentPerson.LastName =
"Smith"
'Save it to the database
db.Save(currentPerson)
'Delete the record in the database
db.Delete(currentPerson)