private static void SubscribeItems()
        {
           DateTime now = DateTime.Now;
 
            ExceptionHandler.LogException(new Exception("Start Subscribe Alarms OPC " + DateTime.Now.ToString()));
 
            List<DAReadItemArguments> ListReadItemsArguments = new List<DAReadItemArguments>();
 
            //subscribe all the alarms to the OPC server
            foreach (Alarm AlarmItem in ListOfAlarms)
            {
                ListReadItemsArguments.Add(new DAReadItemArguments(AlarmItem.OPCDescriptor.MachineName,
                                                                   AlarmItem.OPCDescriptor.ServerName,
                                                                   AlarmItem.OPCDescriptor.OPCItem, 0));
 
 
            }
 
            DAVtqResult[] _DAVtq;
 
            _DAVtq = new DAVtqResult[ListReadItemsArguments.Count];
 
            _DAVtq = OPCClient.ReadMultipleItems(ListReadItemsArguments.ToArray());
			//This Read works correctly /////////////////////
 
            ExceptionHandler.LogException(new Exception("Read Alarms OPC " + (DateTime.Now - now).ToString()));
 
            int i = 0;
 
            foreach (Alarm AlarmItem in ListOfAlarms)
            {
                if (_DAVtq[i] != null && _DAVtq[i].Succeeded && _DAVtq[i].Vtq != null)
                {
                    if (_DAVtq[i].Vtq.Value != null)
                    {
                        AlarmItem.State = (Alarm.AlarmState)(Convert.ToInt16(_DAVtq[i].Vtq.Value));
                    }
                    else
                    {
                        AlarmItem.State = Alarm.AlarmState.Inactive;
                    }
                }
                i++;
            }
 
            ExceptionHandler.LogException(new Exception("fire Alarms OPC event 1st time " + (DateTime.Now - now).ToString()));
 
            // raise the AlarmEvent:
            OnGlobalAlarmsEvent(null, new AlarmSignalEventArgs(ListOfAlarms));
 
            OPCClient.UnsubscribeAllItems();
 
            ExceptionHandler.LogException(new Exception("Subscribe OPC Alarms " + (DateTime.Now - now).ToString()));
 
            //subscribe all the alarms to the OPC server
            foreach (Alarm AlarmItem in ListOfAlarms)
            {
                int SubscriptionID = OPCClient.SubscribeItem(AlarmItem.OPCDescriptor.MachineName, AlarmItem.OPCDescriptor.ServerName, AlarmItem.OPCDescriptor.OPCItem, 50, null);
                //copy the subscription ID, to know later which alarm fired the OPC event
                AlarmItem.OPCDescriptor.SubscriptionID = SubscriptionID;
            }
 
            OPCClient.MultipleItemsChanged += new EventHandler<EasyDAMultipleItemsChangedEventArgs>(OPCClient_MultipleItemsChanged);
 
            ExceptionHandler.LogException(new Exception("END OPC Alarms " + ( DateTime.Now - now ).ToString()));
        }
    }
 
 
	    /// <summary>
        /// Handles the event that occurs if at least one OPC Alarm variable changed its state (from true to false or vice versa)
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private static void OPCClient_MultipleItemsChanged(object sender, EasyDAMultipleItemsChangedEventArgs e)
        {
            if (DesignHelpers.IsDesignTime) return;
 
            lock (ListOfAlarms)
            {
 
                foreach (Alarm AlarmItem in ListOfAlarms)
                {
                    //bool changed = false;
 
                    //Search for all the arguments given in the opc event, which are actives and look for the alarm that fired that event
                    foreach (EasyDAItemChangedEventArgs TempEventArg in e.ArgsArray)
                    {
                        // if the Subscription ID was found, and the Argument is value then set the status of the alarm
                        if ((AlarmItem.OPCDescriptor.SubscriptionID == TempEventArg.Handle) && (TempEventArg.Vtq != null))
                        {
                            Alarm.AlarmState TempValue = (Alarm.AlarmState)(Convert.ToInt16(TempEventArg.Vtq.Value));
 
                        }
 
                    }
                }
            }
 
            // raise the AlarmEvent:
            OnGlobalAlarmsEvent(null, new AlarmSignalEventArgs(ListOfAlarms));
 
			////////This event is not fired
        }