namespace TstDBConnection.Entities{    public class Tree    {        public virtual Guid Id { get; set; }        public virtual string Name { get; set; }    }}

namespace TstDBConnection.Entities{    public class Leaf    {        public virtual Guid Id { get; set; }        public virtual string Name { get; set; }        public virtual Tree Tree { get; set; }    }}

public static void TestMany2One(ISessionFactory sessionFactory)        {            using (ISession session = sessionFactory.OpenSession())            {                Tree tree = new Tree() { Name = "Big Tree" };                Leaf leaf = new Leaf() { Tree = tree, Name = "Leaf A for Big Tree" };                session.Save(leaf);                session.Flush();                var query = from leafT in session.Query
     
      () select leafT;                IList
      
        employees = query.ToList();            }        }
      
     

static void Main(string[] args)        {            log4net.Config.XmlConfigurator.Configure(); // log4net            Configuration configuration = new Configuration();            configuration.Configure();            ISessionFactory sessionFactory = configuration.BuildSessionFactory();            TestMany2One(sessionFactory);            sessionFactory.Close();        }