Do I have to implement Add/Delete methods in my NHibernate entities?

You don't have to do this for nhibernate, you have to do this for keep in-memory consistence and not repeat yourself.

You don't have to. You could just call SomeStore.Products. Add(someProduct) directly from outside of your entity.

But it's often good practice to make the collections 'read-only' from a public perspective, and using an add method in the entity for adding items.

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