>>>I have a customer record, which has one or more account records. Each account can have one or more invoice headers, each with one or more invoice detail records. I wrote a class for each.
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>>>When I create an instance of a customer class and call LoadCustomer, should that process also create a collection of accounts on the customer class. Then, should each account create a collection of invoice headers, which in turn would create a collection of invoice details?
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>>I'm assuming you're talking about DataSets? This is the area where DataSets got a little fuzzy for me (I admit it's probably from my own lack of knowledge) and it why I switched to custom objects.
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>What is so mysterious about DataSets? They are very similar in structure to a database, only in memory.

Like I said, it was probably due to my own lack of knowledge. I would suspect that if I would go back and try to use DataSets I would find it a lot easier using techniques I have learned by using Custom Objects.