[ServiceContract(Namespace = "")]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class NHEmployeeService
    {
        [OperationContract]
        public IList<PersonalInfo> GetAllEmployees()
        {
            return Global.CurrentSession.CreateCriteria(typeof(PersonalInfo)).List<PersonalInfo>();
        }
    }

var proxy = new NHServiceReference.NHEmployeeServiceClient();
            proxy.GetAllEmployeesCompleted += new System.EventHandler<NHServiceReference.GetAllEmployeesCompletedEventArgs>(proxy_GetAllEmployeesCompleted);
            proxy.GetAllEmployeesAsync();

    [DataContract]
    public class PersonalInfo
    {
        [DataMember]
        public virtual int EmployeeID { get; protected set; }
        [DataMember]
        public virtual string FirstName { get; set; }
        [DataMember]
        public virtual string LastName { get; set; }
        [DataMember]
        public virtual DateTime BirthDate { get; set; }
        [DataMember]
        public virtual FamilyStatus FamilyStatus { get; set; }
    }

    [DataContract]
    public class FamilyStatus
    {
        [DataMember]
        public virtual int StatusID { get; set; }
        [DataMember]
        public virtual string StatusName { get; set; }
        [DataMember]
        public virtual IList<PersonalInfo> Employees { get; set; }
    }

public class PersonalInfoMap : ClassMap<PersonalInfo>
    {
        public PersonalInfoMap()
        {
            Table("PersonalInfo");
            Id(x => x.EmployeeID).GeneratedBy.Identity();
            Map(x => x.FirstName).Column("FirstName");
            Map(x => x.LastName).Column("LastName");
            Map(x => x.BirthDate).Column("BirthDate");
            References(x => x.FamilyStatus, "FamilyStatus");
        }
    }

    public class FamilyStatusMap : ClassMap<FamilyStatus>
    {
        public FamilyStatusMap()
        {
            Table("FamilyStatus");
            Id(x => x.StatusID).GeneratedBy.Identity();
            Map(x => x.StatusName).Column("StatusName");
            HasMany(x => x.Employees).AsList().Inverse().Cascade.None();
        }
    }

[KnownTypeAttribute(typeof(FamilyStatus))]
    [DataContract]
    public class PersonalInfo
    {
        [DataMember]
        public virtual int EmployeeID { get; protected set; }
        [DataMember]
        public virtual string FirstName { get; set; }
        [DataMember]
        public virtual string LastName { get; set; }
        [DataMember]
        public virtual DateTime BirthDate { get; set; }
        [DataMember]
        public virtual FamilyStatus FamilyStatus { get; set; }
    }

public class HibernateDataContractSurrogate : IDataContractSurrogate
    {
        #region IDataContractSurrogate Members

        public object GetObjectToSerialize(object obj, Type targetType)
        {
            INHibernateProxy proxy = obj as INHibernateProxy;
            if (proxy != null)
            {
                ILazyInitializer li = proxy.HibernateLazyInitializer;
                obj = (li.IsUninitialized ? null : li.GetImplementation());
            }

            return obj;
        }

        public object GetCustomDataToExport(Type clrType, Type dataContractType)
        {
            return null;
        }

        public object GetCustomDataToExport(MemberInfo memberInfo, Type dataContractType)
        {
            return null;
        }

        public Type GetDataContractType(Type type)
        {
            return type;
        }

        public object GetDeserializedObject(object obj, Type targetType)
        {
            return obj;
        }

        public void GetKnownCustomDataTypes(Collection<Type> customDataTypes)
        {

        }

        public Type GetReferencedTypeOnImport(string typeName, string typeNamespace, object customData)
        {
            return null;
        }

        public CodeTypeDeclaration ProcessImportedType(CodeTypeDeclaration typeDeclaration, CodeCompileUnit compileUnit)
        {
            return typeDeclaration;
        }

        #endregion
    }

public Type GetDataContractType(Type type)
        {
            return type;
        }