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Business Layer Logic (BLL) Is Data?

I think BLL is data. It should not include the SendEmail method. BLL is a place to cache data, manipulate it, and perform business related calculations. Sending email is a business process, but the code that actually sends the email must be outside the BLL namespace.

Is BLL only data?

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BLL is not about data; it's all about what you need to do with data.

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In past teams, I always worked on specific functions that can appear in any program / business, for example, sending an email to my own common class / method. The only time I saw a BLL class related to email was when a business rule was written to send email. In this case, BLL knew the email text to send, but created an instance of a common email class to send email.

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