public VatsResponse Post(Vats request)
        {
            if (request.Vat.Id > 0)
              {
            Bm2s.Data.Common.BLL.Parameter.Vat item = Datas.Instance.DataStorage.Vats[request.Vat.Id];
            item.AccountingEntry = request.Vat.AccountingEntry;
            item.Code = request.Vat.Code;
            item.EndingDate = request.Vat.EndingDate;
            item.Rate = Convert.ToDouble(request.Vat.Rate);
            item.StartingDate = request.Vat.StartingDate;
            Datas.Instance.DataStorage.Vats[request.Vat.Id] = item;
              }
              else
              {
            Bm2s.Data.Common.BLL.Parameter.Vat item = new Data.Common.BLL.Parameter.Vat()
            {
              AccountingEntry = request.Vat.AccountingEntry,
              Code = request.Vat.Code,
              EndingDate = request.Vat.EndingDate,
              Rate = Convert.ToDouble(request.Vat.Rate),
              StartingDate = request.Vat.StartingDate
            };

            Datas.Instance.DataStorage.Vats.Add(item);
            request.Vat.Id = item.Id;
              }

              VatsResponse response = new VatsResponse();
              response.Vats.Add(request.Vat);
              return response;
        }
        public VatsResponse Delete(Vats request)
        {
            Bm2s.Data.Common.BLL.Parameter.Vat item = Datas.Instance.DataStorage.Vats[request.Vat.Id];
              item.EndingDate = DateTime.Now;
              Datas.Instance.DataStorage.Vats[item.Id] = item;

              VatsResponse response = new VatsResponse();
              response.Vats.Add(request.Vat);
              return response;
        }
        public VatsResponse Get(Vats request)
        {
            VatsResponse response = new VatsResponse();
              List<Bm2s.Data.Common.BLL.Parameter.Vat> items = new List<Data.Common.BLL.Parameter.Vat>();
              if (!request.Ids.Any())
              {
            items.AddRange(Datas.Instance.DataStorage.Vats.Where(item =>
              (string.IsNullOrWhiteSpace(request.Code) || item.Code.ToLower().Contains(request.Code.ToLower())) &&
              (!request.Date.HasValue || (request.Date >= item.StartingDate && (!item.EndingDate.HasValue || request.Date < item.EndingDate.Value)))
              ));
              }
              else
              {
            items.AddRange(Datas.Instance.DataStorage.Vats.Where(item => request.Ids.Contains(item.Id)));
              }

              var collection = (from item in items
                        select new Bm2s.Poco.Common.Parameter.Vat()
                        {
                          AccountingEntry = item.AccountingEntry,
                          Code = item.Code,
                          EndingDate = item.EndingDate,
                          Id = item.Id,
                          Rate = Convert.ToDecimal(item.Rate),
                          StartingDate = item.StartingDate
                        }).AsQueryable().OrderBy(request.Order, !request.DescendingOrder);

              response.ItemsCount = collection.Count();
              if (request.PageSize > 0)
              {
            response.Vats.AddRange(collection.Skip((request.CurrentPage - 1) * request.PageSize).Take(request.PageSize));
              }
              else
              {
            response.Vats.AddRange(collection);
              }

              try
              {
            response.PagesCount = collection.Count() / response.Vats.Count + (collection.Count() % response.Vats.Count > 0 ? 1 : 0);
              }
              catch
              {
            response.PagesCount = 1;
              }

              return response;
        }