NHibernate Pitfalls: Sharing a Session in Multiple Threads

The NHibernate ISession is not thread-safe, that is, it shouldn’t be shared by multiple threads. The ISessionFactory, however, is thread-safe, and thus it should be used to create ISession instances as needed. Do not worry, creating sessions does not mean that connections to the database are immediately open and kept alive, the ISession implementation only opens database connections when they are necessary and closes them when they cease to be.