C#

xml_document = new XDocument();

xml_document.Declaration = new XDeclaration("1.0", "utf-8", "true");

xml_document.Add(new XElement("EventLog"));
XElement event_node = new XElement("Event", new XAttribute("ID", Guid.NewGuid().ToString()));
XElement event_date = new XElement("DateTime", DateTime.UtcNow.ToString("ddd dd MMM yyyy HH:mm:ss"));
XElement event_details = new XElement("Description", event_description);

event_node.Add(event_date);
event_node.Add(event_details);

//append element
xml_document.Add(event_node);

xml_document.Save("eventlog.xml");                

public class RecipsMap : ClassMap<Data.Database.Recipe>
      {
            public RecipsMap()
            {
                  this.Table("Recipe");
                  this.Id(x => x.Id).GeneratedBy.Native().Column("Id").UnsavedValue(0);
                  this.Map(x => x.Name).Not.Nullable().Length(50).Unique();
                  this.Map(x => x.Description).Nullable();
                  this.Map(x => x.Span);
                  this.HasMany<Data.Database.Temperature>(x => x.Temperatures).Table("Temperature").Inverse().Cascade.AllDeleteOrphan();
                  this.HasMany<Data.Database.LampControl>(x => x.LampControls).Table("LampControl").Inverse().Cascade.AllDeleteOrphan();
            }
      }

/** Удалить все */
            public void Delete()
            {
                  var metadata = this._sessionFactory.GetClassMetadata(typeof(T)) as NHibernate.Persister.Entity.AbstractEntityPersister;
                  string table = metadata.TableName;

                  using (var session = this._sessionFactory.OpenSession())
                  {
                        using (var transaction = session.BeginTransaction())
                        {
                              string deleteAll = string.Format("DELETE FROM \"{0}\"", table);
                              session.CreateQuery(deleteAll).ExecuteUpdate();
                              transaction.Commit();
                        }
                  }

                  /** сообщим коллбэку что данные изменены */
                  this.OnOnDataChange(this.Get());
            }


            /** Удалить по имени */
            public void Delete(string name)
            {
                  using (var session = this._sessionFactory.OpenSession())
                  {
                        using (var transaction = session.BeginTransaction())
                        {
                              T recipe = session.QueryOver<T>().Where(Restrictions.Eq("Name", name)).SingleOrDefault();
                              session.Delete(recipe);
                              transaction.Commit();
                        }
                  }

                  /** сообщим коллбэку что данные изменены */
                  this.OnOnDataChange(this.Get());
            }