c# - asp net mvc validation and ViewModel -

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i have 4 layer solution medium size project:

  1. model (ef poco entities)
  2. data (ef objectcontext)
  3. services

  4. asp net mvc question

    a)should have validation attributes- dataanotation in models or mvc project?

    b)where should set viewmodel-s if in mvc fill viewmodels data, in controller? else if on other project should create repository vewmodel?

    c) should viewmodel have validation>?

a, c) if have view models different dtos, might prefer use dataannotations in both types. way, can validate before try persist , again persist in case dtos used outside scope of mvc app.

b) tuck view models models folder of mvc app , dtos data project separate mvc app. use automapper lot copy values between view models , dtos.


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