If I need to retrieve an object from a custom model binder should the binder interact with the service layer, the repository layer, or …? Asp.Net MVC?

What I do is use a view/presentation model instead of binding to business objects. Remember that your users might enter invalid values, and you will need to re-display these invalid values to the user when prompting them to correct their mistakes. But your "real" business objects probably won't accept invalid values.

So the view model must allow for any user input, even input the business objects won't accept.

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