gistfile1.cs

    public class Usuario
    {
        public class Map : ClassMap<Usuario>
        {
            public Map()
            {
                Table("tsdrusu0");
                Id(x => x.Id).Column("id_usu");
                Map(x => x.NmLogin).Column("nm_login");
            }
        }
        public virtual int Id { get; set; }
        public virtual string NmLogin { get; set; }
    }


    class Program
    {
        static void Main(string[] args)
        {
            Simply.Do.Configure.NHibernateQuickly(
                @".\sqlexpress", "sdrh", typeof(Program).Assembly);

            using (var context = Simply.Do.EnterContext())
            {
                var list = context.Session.Query<Usuario>().ToList();

                Console.WriteLine(list.Count);
            }

        }
    }