SerializePageContents(
            SerializableObjectContext serializableObjectContext
            )
        {
            //
            // Serialize each PageContent in PageContentColleciton
            //
            IEnumerator enumerator = ((IEnumerable)serializableObjectContext.TargetObject).GetEnumerator();

            enumerator.Reset();

            PageContentCollectionSerializerContext
                context = new PageContentCollectionSerializerContext(this,
                                                                     serializableObjectContext,
                                                                     enumerator,
                                                                     SerializerAction.serializeNextPageContent);

            ((IXpsSerializationManagerAsync)SerializationManager).OperationStack.Push(context);
        }
        SerializeNextPageContent(
            IEnumerator enumerator,
            SerializableObjectContext serializableObjectContext
            )
        {
            if (enumerator.MoveNext())
            {
                PageContentCollectionSerializerContext
                    context = new PageContentCollectionSerializerContext(this,
                                                                         serializableObjectContext,
                                                                         enumerator,
                                                                         SerializerAction.serializeNextPageContent);


                ((IXpsSerializationManagerAsync)SerializationManager).OperationStack.Push(context);

                object pageContent = enumerator.Current;

                SerializePageContent(pageContent);
            }
        }
        AsyncOperation(
            ReachSerializerContext context
            )
        {
            if (context == null)
            {
            }

            switch (context.Action)
            {
            case SerializerAction.endPersistObjectData:
            {
                EndPersistObjectData();
                break;
            }

            case SerializerAction.serializeNextPageContent:
            {
                PageContentCollectionSerializerContext thisContext =
                    context as PageContentCollectionSerializerContext;

                if (thisContext != null)
                {
                    SerializeNextPageContent(thisContext.Enumerator,
                                             thisContext.ObjectContext);
                }

                break;
            }

            default:
            {
                base.AsyncOperation(context);
                break;
            }
            }
        }