mapping issue

i made model using this tool. i added only one tabe in project and mapped it result with one model class. But when i try to select query from tabel it results null.

            Dim cfg As New Configuration()


            cfg.Properties.Add(NHibernate.Cfg.Environment. _
              ConnectionProvider, GetType(NHibernate.Connection. _
              DriverConnectionProvider).AssemblyQualifiedName)

            cfg.Properties.Add(NHibernate.Cfg.Environment.Dialect, _
              GetType(NHibernate.Dialect.MsSql2012Dialect). _
              AssemblyQualifiedName)

            cfg.Properties.Add(NHibernate.Cfg.Environment.ConnectionDriver, _
              GetType(NHibernate.Driver.SqlClientDriver). _
              AssemblyQualifiedName)

            cfg.Properties.Add(NHibernate.Cfg.Environment.ConnectionStringName, _

"connectionstring") cfg.Properties.Add(NHibernate.Cfg.Environment.ShowSql, True)

            cfg.Properties.Add(NHibernate.Cfg.Environment. _
          ProxyFactoryFactoryClass, GetType _
          (NHibernate.Bytecode.DefaultProxyFactoryFactory). _
          AssemblyQualifiedName)

            cfg.AddAssembly("assemblyname")


            Dim s2 As NHibernate.ISessionFactory = cfg.BuildSessionFactory

Dim q = db.Query(Of userclass)() and when i try to do this Dim myTransaction As ITransaction = db.BeginTransaction Dim cust As New userclass cust.Username = "suhail" cust.Fname = "s" cust.Lname = "k" cust.Device = 1 cust.Email = "sk@sk.com" db.Save(cust) myTransaction.Commit() db.Close() It results no presist userclass.