Ninja Snacks Tales From the Enterprise

CQRS - erm OOP and Validations

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A discussion came up recently on the DDD/CQRS forums recently, that got sidetracked into 'where do the validations go' (along with a lot of weird nonsense about async command queues, http status code pedantry, etc, but we'll leave that for some other time). A large minority of developers - perhaps even a majority - seem to think that validations belong somewhere in the 'trusted' client.

I find this conclusion strange, as none of the .net framework code we work with on a daily basis actually works this way.