C# NHibernate - Accessing an element's list throws error (failed to lazily initialize…)?

In GetCar you close the session (due to the using ), before you access the Tires-collection later on in your code. Collections are loaded lazily by default in nHibernate, so make sure you fetch the collection before ending the transaction. You could use Eager loading to make sure nHibernate loads the child collection as well.

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