using System.ServiceModel;
 
namespace WcfService1
{
    // NOTE: If you change the interface name "IService1" here, you must also update the reference to "IService1" in Web.config.
    [ServiceContract]
    public interface IService1
    {
 
        [OperationContract]
        string GetData();
    }
}

// WcfService1: A simple Web service using WCF technology. Provides a GetData method to read a value of an OPC item.
// Use WcfClient1 project (under Console folder) to test this Web service.
 
using OpcLabs.EasyOpc.DataAccess;
 
namespace WcfService1
{
    // NOTE: If you change the class name "Service1" here, you must also update the reference to "Service1" in Web.config and in the associated .svc file.
    public class Service1 : IService1
    {
        public string GetData()
        {
            var easyDAClient = new EasyDAClient();
            object value = easyDAClient.ReadItemValue("", "OPCLabs.KitServer.2", "Demo.Ramp");
            return (value == null) ? "" : value.ToString();
        }
    }
}

// WcfClient1: Using a Web service provided by the WcfService1 project (under Web folder), gets and displays a value of 
// an OPC item.
 
using System;
 
namespace WcfClient1
{
    class Program
    {
        static void Main()
        {
            var client = new Service1Client();
 
            // Use the 'client' variable to call operations on the service.
            Console.WriteLine(client.GetData());
            Console.ReadLine();
 
            // Always close the client.
            client.Close();
        }
    }
}