Hiya JimB
>
>Not necessarily. My business tier may have data driven rules enforcement and the only change required is the meta data for the business tier.
I have found that you can avoid a lot of problems if you standardize messaging between objects. I try like heck to avoid relying on custom object properties and methods (even though it's impossible to totally avoid). So, my apps "know" that to check a bizrule violation in an object, they need to check an Alert property for the violation.
In short, I try to pack base functionality into a superclass where possible. My subclasses are actor specific and have certain behavior.
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John Koziol, ex-MVP, ex-MS, ex-FoxTeam. Just call me "X"
"When the going gets weird, the weird turn pro" - Hunter Thompson (Gonzo) RIP 2/19/05