public DataTable ReadRaw(DateTime startTime, DateTime endTime, int maxValues, bool inclubeBounds)
        {
            Opc.Hda.Time hdaStartTime = new Time(startTime);
            Opc.Hda.Time hdaEndTime = new Time(endTime);
            DataTable dataTable = new DataTable("Data");
            DataColumn timestamp = new DataColumn("TimeStamp");
            DataColumn value = new DataColumn("Value");
            DataColumn quality = new DataColumn("Quality");
            dataTable.Columns.Add(timestamp);
            dataTable.Columns.Add(value);
            dataTable.Columns.Add(quality);

            Opc.ItemIdentifierCollection itemIdentifierCollection = null;
            Opc.ItemIdentifier[] items = null;
            int index = 0;
            if (_hdaServer.Items.Count != 0)
            {
                itemIdentifierCollection = _hdaServer.Items;
                items = new Opc.ItemIdentifier[itemIdentifierCollection.Count];
            }

            Opc.Hda.Trend group = new Opc.Hda.Trend(_hdaServer);

            foreach (Opc.ItemIdentifier itemIdentifier in itemIdentifierCollection)
            {
                items[index] = itemIdentifier;
                Opc.IdentifiedResult[] results = group.Server.ValidateItems(new Opc.ItemIdentifier[] { itemIdentifier });
                group.AddItem(itemIdentifier);

                index++;
            }

            group.Name = String.Format("{0}-{1}", group.Server.Url.HostName, Guid.NewGuid().ToString());
            group.EndTime = new Opc.Hda.Time(endTime);
            group.StartTime = new Opc.Hda.Time(startTime);
            TimeSpan span = endTime.Subtract(startTime);
            int calcinterval = ((int)span.TotalSeconds);
            group.ResampleInterval = (decimal)calcinterval;
            group.AggregateID = Opc.Hda.AggregateID.DURATIONGOOD;
            group.MaxValues = maxValues;
            ItemValueCollection[] values = group.ReadRaw();

            foreach (ItemValueCollection itemValueCollection in values)
            {
                foreach (ItemValue itemValue in itemValueCollection)
                {
                    DataRow dataRow = dataTable.NewRow();
                    dataRow["Timestamp"] = itemValue.Timestamp;
                    dataRow["Value"] = itemValue.Value;
                    dataRow["Quality"] = itemValue.Quality;
                    dataTable.Rows.Add(dataRow);
                }
            }

            return dataTable;
        }