public bool MergePageResponseDetail(PageResponseDetail pageResponseDetail)
        {
            // Assume that the page has been updated
            var hasBeenUpdated = true;

            if (PageResponseDetailList.Count > 0)
            {
                // Check if the page already exists in the PageResponseDetail.
                // Either the index to the existing page response detail will be returned
                // or a negative number which is the one's complement of the insertion point will be returned.
                int index = GetPageResponseDetailIndexByPageNumber(pageResponseDetail.PageNumber);
                if (index >= 0)
                {
                    // Check to see if the page has been updated
                    hasBeenUpdated = !(PageResponseDetailList[index].Equals(pageResponseDetail));
                    if (hasBeenUpdated)
                    {
                        pageResponseDetail.HasBeenUpdated = hasBeenUpdated;
                        PageResponseDetailList[index]     = pageResponseDetail;
                    }
                }
                else
                {
                    hasBeenUpdated = true;
                    pageResponseDetail.HasBeenUpdated = hasBeenUpdated;

                    // The one's complement is the insertion index
                    index = ~index;

                    if (index >= PageResponseDetailList.Count)
                    {
                        PageResponseDetailList.Add(pageResponseDetail);
                    }
                    else
                    {
                        PageResponseDetailList.Insert(index, pageResponseDetail);
                    }
                }
            }
            else
            {
                hasBeenUpdated = true;
                pageResponseDetail.HasBeenUpdated = hasBeenUpdated;
                PageResponseDetailList.Add(pageResponseDetail);
            }

            if (!PageIds.Contains(pageResponseDetail.PageId))
            {
                PageIds.Add(pageResponseDetail.PageId);
                PageIds.Sort();
            }

            return(hasBeenUpdated);
        }
        public void AddPageResponseDetail(PageResponseDetail pageResponseDetail)
        {
            var existingItem = PageResponseDetailList.SingleOrDefault(p => p.PageId == pageResponseDetail.PageId);

            if (existingItem != null)
            {
                PageResponseDetailList.Remove(existingItem);
            }
            FormId   = FormId ?? pageResponseDetail.FormId;
            FormName = FormName ?? pageResponseDetail.FormName;
            pageResponseDetail.FormId     = FormId;
            pageResponseDetail.FormName   = FormName;
            pageResponseDetail.ResponseId = ResponseId;
            PageResponseDetailList.Add(pageResponseDetail);
            PageIds = PageResponseDetailList.Select(p => p.PageId).OrderBy(pid => pid).ToList();
        }