I’m using .NET MVC 3 Code-First approach. My domain have a entity called Question, this entity have a Score property that is Byte and I want to replace that property to an Enum and name this Enum to Score where I can set the values from 0 to 10.
Where should Enums live in that structure? In a folder called Enums in my Model folder?
Update:
That’s my project Structure in Models folder:

It sounds like you have a value object. I’d put it in the same place you put other value objects in your domain, which really depends on your folder structure. Definitely in the Model folder, but if you’re subdividing the model folder, it depends on how you’re doing that. Do you have a Q&A subfolder? Maybe it goes there next to questions. Or do you have a Value Objects subfolder? Maybe there.