Simple OPC client - that doesn't work.

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Text;
using Softing.OPCToolbox;
using Softing.OPCToolbox.Client;

namespace opc_simple
{
    class Program
    {
        protected DaSession session;
        protected DaSubscription subscription;
        protected DaItem item;

        public Program(string server_name, string item_name) {
            int result;
            //	TODO - Optionally pass in a license file
            //result = Application.Instance.Activate(EnumFeature.DA_CLIENT, "XXXX-XXXX-XXXX-XXXX-XXXX");
            //if (ResultCode.SUCCEEDED(result)) throw new Exception("Could not activate using this license key");
            //	END TODO - design time license activation

            // Proceed with the OPC Toolbox core initialization
            result = Application.Instance.Initialize();
            if (!ResultCode.SUCCEEDED(result)) throw new Exception("Could not initialize application");

            // Connect a session to the server
            session = new DaSession(server_name);
            result = session.Connect(true, false, null);
            if (!ResultCode.SUCCEEDED(result)) throw new Exception("Could not connect to the server");

            // Set up the item
            subscription = new DaSubscription(1000, session);
            item = new DaItem(item_name, subscription);
        }

        public void read()
        {
            int result;

            DaItem[] items = { item };
            ValueQT[] values = null;
            int[] results = null;

            result = subscription.Read(0, items, out values, out results, null);
            if (!ResultCode.SUCCEEDED(result)) throw new Exception("Read operation failed");
            if (!ResultCode.SUCCEEDED(results[0])) throw new Exception("Read item failed");
            Console.Out.WriteLine("Read item: " + results[0].ToString());
        }

        static void Main(string[] args) {
            Program program = new Program(
                "opcda:///Softing.OPCToolboxDemo_ServerDA.1/{2E565242-B238-11D3-842D-0008C779D775}", 
                "maths.sin"
            );
            Console.Out.WriteLine("Connected to the server!");
            program.read();
            Console.Out.WriteLine("Read the item!");
        }
    }
}