Carrotware.CMS.Core.EditHistory.GetHistoryList C# (CSharp) Method

        public static List<EditHistory> GetHistoryList(string orderBy, int pageNumber, int pageSize,
            Guid siteID, bool showLatestOnly, DateTime? editDate, Guid? editUserID)
        {
            SortParm srt = new SortParm(orderBy);

            if (String.IsNullOrEmpty(srt.SortField)) {
                srt.SortField = "EditDate";
            }

            if (String.IsNullOrEmpty(srt.SortDirection)) {
                srt.SortDirection = "DESC";
            }

            Guid userID = Guid.Empty;
            if (editUserID.HasValue) {
                userID = editUserID.Value;
            }

            DateTime dateStart = DateTime.UtcNow.Date.AddDays(-2);
            DateTime dateEnd = DateTime.UtcNow.Date.AddDays(1);

            if (editDate.HasValue) {
                dateStart = editDate.Value.Date.AddDays(-8);
                dateEnd = editDate.Value.Date.AddDays(1);
            }

            int startRec = pageNumber * pageSize;

            if (pageSize < 0 || pageSize > 200) {
                pageSize = 25;
            }

            if (pageNumber < 0 || pageNumber > 10000) {
                pageNumber = 0;
            }

            bool IsContentProp = false;

            srt.SortField = (from p in ReflectionUtilities.GetPropertyStrings(typeof(vw_carrot_EditHistory))
                             where p.ToLowerInvariant().Trim() == srt.SortField.ToLowerInvariant().Trim()
                             select p).FirstOrDefault();

            if (!String.IsNullOrEmpty(srt.SortField)) {
                IsContentProp = ReflectionUtilities.DoesPropertyExist(typeof(vw_carrot_EditHistory), srt.SortField);
            }

            using (CarrotCMSDataContext _db = CarrotCMSDataContext.Create()) {
                List<EditHistory> _history = null;

                IQueryable<vw_carrot_EditHistory> QueryInput = (from h in _db.vw_carrot_EditHistories
                                                                where h.SiteID == siteID
                                                                    && (!showLatestOnly || h.IsLatestVersion == true)
                                                                    && (!editDate.HasValue
                                                                          || (h.EditDate.Date >= dateStart.Date && h.EditDate.Date <= dateEnd.Date))
                                                                    && (!editUserID.HasValue || h.EditUserId == userID)
                                                                select h);

                if (IsContentProp) {
                    QueryInput = ReflectionUtilities.SortByParm<vw_carrot_EditHistory>(QueryInput, srt.SortField, srt.SortDirection);
                } else {
                    QueryInput = (from c in QueryInput
                                  orderby c.EditDate descending
                                  where c.SiteID == siteID
                                  select c).AsQueryable();
                }

                _history = (from h in QueryInput.Skip(startRec).Take(pageSize) select new EditHistory(h)).ToList();

                return _history;
            }
        }