Nhibernate sessionfactory instance more than once on web service?

I think you already mentioned the solution. You have to use a Singleton for the Sessionfactory-Provider. Personally I prefer to use Spring to manage my ApplicationContext an wire my objects but you don't have to.

Simply don't use the NbernatePersistencia-Object as a Service but as a SessionProvider and you are fine.

I think you already mentioned the solution. You have to use a Singleton for the Sessionfactory-Provider. Personally I prefer to use Spring to manage my ApplicationContext an wire my objects but you don't have to.

Simply don't use the NbernatePersistencia-Object as a Service but as a SessionProvider and you are fine. Your Service could look like this: public class YourService : IYourService { public User GetUsers(int id) { using(NOpenSession()) { return session. Load(typeof(user), id); } } } ...and for you SessionProvider i'd suggest to always open new sessions per request.

Long term sessions are slow and growing. Considering multiple users in a webservice this does not seem to be a good idea. Public class NbernatePersistencia { /* ... */ public ISession OpenSession() { return this.SessionFactory.OpenSession(); } /* ... */ } It's simple but should work.

Maybe you want to take a look at this NHForge-Example. The NbernateHelper there is pretty much like your NbernatePersistencia-Class.

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