The appropriate method to perform a transaction using Nhibernate Framework

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VB

Hi every Body,
I'm using The CodeSmith Generator professional edition V5.05 with NHibernate Framework (VB.net)
I generate all my classes with no problems, but I want to understand what is the significance of using the ManagerObjects classes.
I have a EMPLOYEE table in my database ; after generation I obtain the following classes :
EMPLOYEE.vb , EMPLOYEEManager.vb and base classes.
So I can perform a saveOrUpdate transaction using 2 methods :

Method1 : Using the ManagerObjects classes

Dim managerFac As IManagerFactory = New ManagerFactory()
Try
                managerFac.GetEMPLOYEEManager.Session.BeginTransaction()
                managerFac.GetEMPLOYEEManager.SaveOrUpdate(CType(currentObject, EMPLOYEE))
                managerFac.GetEMPLOYEEManager.Session.CommitTransaction()
Catch ex As Exception
                managerFac.GetEMPLOYEEManager.Session.RollbackTransaction()
                MessageBox.Show(ex.Message)
End Try

Method2 : Without Using the ManagerObjects classes

Dim config As New NHibernate.Cfg.Configuration
Dim sessionFactory As NHibernate.ISessionFactory = config.Configure.BuildSessionFactory
Dim session As NHibernate.ISession
Dim transaction As NHibernate.ITransaction
Try
                ModuleApplication.session = sessionFactory.OpenSession()
                ModuleApplication.transaction = ModuleApplication.session.BeginTransaction()
                ModuleApplication.transaction.Begin()
                ModuleApplication.session.SaveOrUpdate(CType(currentObject, EMPLOYEE))
                ModuleApplication.transaction.Commit()
Catch ex As Exception
                ModuleApplication.transaction.Rollback()
                MessageBox.Show(ex.Message)
End Try

Please Help Me to understand what is the difference between those 2 methods, and what is the significance of using the ManagerObjects classes.
Thanks in advance Wink