i use mvc2, nhibernate 2.1.2 in controller class i call foreachParty method like this:

 OrganizationStructureService.ForEachParty<Department>(department, null, p =>
        {
            p.AddParentWithoutRemovingExistentAccountability(domainDepartment, AccountabilityTypeDbId.SupervisionDepartmentOfDepartment);

        }
        }, x => (!(x.AccountabilityType.Id == (int)AccountabilityTypeDbId.SupervisionDepartmentOfDepartment)));

static public void ForEachParty(Party party, PartyTypeDbId? partyType, Action action, Expression> expression = null) where T : Party { IList chilrden = new List(); IList acc = party.Children;

        if (party != null)
            action(party);

        if (partyType != null)
            acc = acc.Where(p => p.Child.PartyTypes.Any(c => c.Id == (int)partyType)).ToList();

        if (expression != null)
            acc = acc.AsQueryable().Where(expression).ToList();

        Parallel.ForEach(acc, p =>
        {
            if (partyType == null)
                ForEachParty<T>(p.Child, null, action);
            else
                ForEachParty<T>(p.Child, partyType, action);
        });
    }

but just after executing the action on foreach.parallel, i dont know why the conversation is getting closed and i see "current conversation is not initilized yet or its closed"