[WebMethod()]
public MyEntity [] LoadAllPlans ()
        {
             IList<MyEntity> entitiesList = Session.CreateCriteria(typeof(MyEntity)).List<MyEntity>();
            KpmPlanEntity [] entities = new KpmPlanEntity[entitiesList.Count];
            entitiesList.CopyTo(entities, 0);
            return entities;
        }

[WebMethod()]
public MyEntity LoadPlan(Guid id)
        {
            return Session.Load(typeof(MyEntity), id) as MyEntity;
        }

System.Web.Services.Protocols.SoapException was unhandled
  Message="System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: CProxyTypeKpmPlanEntityEntities_INHibernateProxy_ISerializable2 cannot be serialized because it does not have a parameterless constructor.\n   at System.Xml.Serialization.TypeDesc.CheckSupported()\n   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type type, MemberInfo source, Boolean directReference, Boolean throwOnError)\n   at System.Xml.Serialization.XmlSerializationWriter.CreateUnknownTypeException(Type type)\n   at System.Xml.Serialization.XmlSerializationWriter.CreateUnknownTypeException(Object o)\n   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write10_KpmPlanEntity(String n, String ns, KpmPlanEntity o, Boolean isNullable, Boolean needType)\n   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write13_LoadPlanResponse(Object[] p)\n   at Microsoft.Xml.Serialization.GeneratedAssembly.ArrayOfObjectSerializer5.Serialize(Object objectToSerialize, XmlSerializationWriter writer)\n   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)\n   --- End of inner exception stack trace ---\n   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id)\n   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle)\n   at System.Web.Services.Protocols.SoapServerProtocol.WriteReturns(Object[] returnValues, Stream outputStream)\n   at System.Web.Services.Protocols.WebServiceHandler.WriteReturns(Object[] returnValues)\n   at System.Web.Services.Protocols.WebServiceHandler.Invoke()\n   --- End of inner exception stack trace ---"
  Source="System.Web.Services"
  Actor=""
  Lang=""
  Node=""
  Role=""

[WebMethod]
public List<Story> GetStoriesBySubmittingUser( int userID )
{
        return NHDaoFactory.GetStoryDao().GetByUser( userID ) as List<Story>;
}

[XmlIgnore]
public virtual IList< Comment > CommentList
{
       get { return commentList; }
       set { commentList = value; }
}