What is the difference between IDbSet.Add and DbEntityEntry.State = EntityState.Added?

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When you use dbContext.SomeEntitySet.Add(entityInstance); the status for this and all its related entities/collections is set to added, while dbContext.Entry(entityInstance).State = EntityState.Added; adds also all the related entities/collections to the context but leaves them as unmodified.
So if the entity that you are trying to create has a related entity (and it’s value its not null), when you use Add it will create a new object for that child entity, while with the other way it won’t.

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