UAClient.SetOpcCompliance();

handle = uaClient.SubscribeMonitoredItem(serverUri, string.Format(NodeDescriptorFormat, nodeId), interval, callback);

private void OpcRgbColor_MonitoredItemChanged(object sender, OpcLabs.EasyOpc.UA.OperationModel.EasyUAMonitoredItemChangedEventArgs e)
{
    if (e.Exception == null)
    {
        LineUserControl.InkTrainColor = convertToColorFromArgb(e);
    }
    else
    {
        Logger.Error(string.Format("{0}[{1}].diRgbColor : {2}", MachineConfiguration.Module.Name, MachineConfiguration.ModuleNumber, e.Exception.GetBaseException().Message));
    }
}

namespace DGpS.OPC
{
    public class UAClient : IDisposable
    {
	private EasyUAClient uaClient;
 
        public UAClient()
        {
            uaClient = new EasyUAClient();
        }
 
        public static void SetOpcCompliance()
        {
            EasyUAClient.AdaptableParameters = EasyUAAdaptableParameters.OpcCompliance;
        }
 
        public CheckData checkCommunication(string serverUri, string nodeDescriptorFormatstring, string nodeMainDescriptor, string nodeId)
        {
            CheckData result = new CheckData(serverUri, nodeDescriptorFormatstring, nodeMainDescriptor, nodeId);
            result.Messsage = string.Empty;
            result.Quality = false;
 
            try
            {
                string setUANodeDescriptor = string.Format("{0};{1}.{2}", nodeDescriptorFormatstring, nodeMainDescriptor, nodeId);
                result.value = uaClient.ReadValue(new UAEndpointDescriptor(serverUri), new UANodeDescriptor(setUANodeDescriptor));
                result.Quality = true;
            }
            catch (UAException e)
            {
                result.Messsage = (e.GetBaseException().Message.ToString());
            }
 
            return result;
        }
 
	//Read, write and subscribe methods
    }
}
 
    public class CheckData
    {
        public CheckData(string serverUri, string nodeDescriptorFormat, string nodeMainDescription, string nodeId)
        {
            ServerUri = serverUri;
            NodeDescriptorFormat = nodeDescriptorFormat;
            NodeMainDescription = nodeMainDescription;
            NodeId = nodeId;
        }
 
        public string ServerUri { get; private set; }
        public string NodeDescriptorFormat { get; private set; }
        public string NodeMainDescription { get; private set; }
        public string NodeId { get; private set; }
        public bool Quality { get; set; }
        public string Messsage { get; set; }
        public object value { get; set; }
    }

namespace DGpS.OPC
{
    public static class OPCLogging
    {
        public static void Activate()
        {
            EasyUAClient.LogEntry += EasyUAClient_LogEntry;
        }
 
        private static void EasyUAClient_LogEntry(object sender, OpcLabs.BaseLib.Diagnostics.LogEntryEventArgs e)
        {
            //OPC version 5.40
            switch (e.EntryType)
            {
                case OpcLabs.BaseLib.Diagnostics.LogEntryType.Error:
                    Logging.Logger.Error(string.Format("EasyUAClient: {1}, {0}", e.Message, e.Source));
                    break;
                case OpcLabs.BaseLib.Diagnostics.LogEntryType.Warning:
                    Logging.Logger.Warning(string.Format("EasyUAClient: {1}, {0}", e.Message, e.Source));
                    break;
                case OpcLabs.BaseLib.Diagnostics.LogEntryType.Information:
                    Logging.Logger.Info(string.Format("EasyUAClient: {1}, {0}", e.Message, e.Source));
                    break;
                default:
                    Logging.Logger.Debug(string.Format("EasyUAClient: {1}, {0} Type: {2} Category:{3}", e.Message, e.Source, e.EntryType, e.Category));
                    break;
            }
        }
    }
}

OPCLogging.Activate();
UAClient.SetOpcCompliance();
UAClient _uaClient = new DGpS.OPC.UAClient();
 
//Check if we have a connection
While(CheckingConnection)
{
    DGpS.OPC.CheckData refObect = _uaClient.checkCommunication(mc.PLC.UAAddress, nodeDescriptorFormat, mc.PLC.NodeDescriptor, nodeID);
    //Process result
}
if(OPC_Connection)
{
    //Start HMI
    //Create new UAClient(s)
    //Create Subscriptions
}

System.ObjectDisposedException: Cannot access a disposed object.
Object name: 'AllowEndpointDomainControl'.
   at System.Windows.Forms.Control.CreateHandle()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.ControlCollection.Add(Control value)
   at OpcLabs.BaseLib.Forms.ParallelNotifierForm.SetCustomControl(Control customControl)
   at OpcLabs.BaseLib.Forms.ParallelNotifierForm.ShowSelectedNotification()
   at OpcLabs.BaseLib.Forms.ParallelNotifierForm.SelectedNotificationChanged()
   at OpcLabs.BaseLib.Forms.ParallelNotifierForm.notificationListView_SelectedIndexChanged(Object sender, EventArgs e)
   at System.Windows.Forms.ListView.OnSelectedIndexChanged(EventArgs e)
   at System.Windows.Forms.ListView.WmReflectNotify(Message& m)
   at System.Windows.Forms.ListView.WndProc(Message& m)
   at OpcLabs.BaseLib.Forms.ListViewNoFlicker.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)