使用NHibernate在Web層實現碰到的問題﹐請NHibernate高手指點﹐多謝!!

使用NHibernate在Web層在按鈕下實現這個﹐不能添加數據﹐請問什么原因﹐是不是配置文件有問題﹐在web.config中已經加了這個
<configSections>
<section name="nhibernate" type="System.Configuration.NameValueSectionHandler, System,Version=1.0.5000.0,Culture=neutral, PublicKeyToken=b77a5c561934e089" />

</configSections>
也加了這個
<nhibernate>
<add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver"/>
<add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider"/>
<add key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect"/>
<add key="hibernate.connection.connection_string" value="server=MIS03;uid=sa;pwd=;"/>
</nhibernate>
我的代碼碼如下﹕
按鈕下實現如下:

Configuration cfg = new Configuration();
cfg.AddAssembly("GuestBook.Data");
ISessionFactory f = cfg.BuildSessionFactory();
ISession s = f.OpenSession();
ITransaction t = s.BeginTransaction();
Users newUser = new Users();
newUser.Name = "papersnake";
newUser.Password = "123456";
newUser.Email = "you@hotmail.com";
newUser.RegTime = DateTime.Now;
s.Save(newUser);
t.Commit();
s.Close();