private void Write1(Thing thing)
		{
			thing.Value = 20.0;
			getSession().Update(thing);
		}
		protected virtual void SaveNewThing()
		{
			var s = sessionManager.OpenSession();
			var thing = new Thing(18.0);
			thingId = (Guid)s.Save(thing);
		}
		protected virtual void Write2InTx(Thing t)
		{
			Assert.That(manager.Count, Is.EqualTo(2));
			getSession().Delete(t);
		}