public static void TestPercentDeadbandAbb(){
            using(var client = new EasyDAClient()){
                client.ItemChanged += client_ItemChanged_PercentDeadband;
                Console.WriteLine("Subscribing with 10% deadband...");
                var handle = client.SubscribeItem("", "Freelance2000OPCServer.110.1", "62_TICA227_PV",
                                                  VarTypes.Empty, 100, 10.0f, null);
 
                Console.WriteLine("Waiting for 30 seconds...");
                Thread.Sleep(30 * 1000);
 
                Console.WriteLine("Changing subscription to 0% deadband...");
                client.ChangeItemSubscription(handle, new DAGroupParameters(100, 0.0f));
 
                Console.WriteLine("Waiting for 30 seconds...");
                Thread.Sleep(30 * 1000);
 
                Console.WriteLine("Unsubscribing...");
                client.UnsubscribeAllItems();
 
                Console.WriteLine("Waiting for 10 seconds...");
                Thread.Sleep(10 * 1000);
            }
        }
 
        // Item changed event handler
        static void client_ItemChanged_PercentDeadband(object sender, EasyDAItemChangedEventArgs e){
            count++;
            if(e.Succeeded)
                Console.WriteLine(e.Vtq);
            else
                Console.WriteLine("*** Failure: {0}", e.ErrorMessageBrief);
        }