Configuration config = Fluently.Configure()
    .Database(MsSqlConfiguration.MsSql2008.ConnectionString(
                  c => c.FromConnectionStringWithKey("ConnectionString"))
                  .Cache(c =>
                         c.UseQueryCache()
                             .QueryCacheFactory<StandardQueryCacheFactory>()
                             .ProviderClass<HashtableCacheProvider>()
                             .UseMinimalPuts()
                  )
                  .UseReflectionOptimizer()
                  .MaxFetchDepth(4)
                  .AdoNetBatchSize(1000)
    )
    .Mappings(m => m.FluentMappings.AddFromAssemblyOf<BillingRecordMap>()
                       .Conventions.AddFromAssemblyOf<EnumConvention>())
    .BuildConfiguration();
 
config.SetProperty(NHibernate.Cfg.Environment.GenerateStatistics, "true");
config.SetProperty(NHibernate.Cfg.Environment.SessionFactoryName, "YourSessionFactoryName");
 
ISessionFactory sessionFactory = config.BuildSessionFactory();