using System;
using System.ServiceModel;

[ServiceContract]
public interface IAddOne
{
    [OperationContract(Name = "addOne_1")]
    int addOne(int x);

    [OperationContract(Name = "addOne_2")]
    void addOne(ref int y, int x);

    [OperationContract(Name = "addOne_3")]
    void addOne(int x, ref int y);

    [OperationContract(Name = "addOne_4")]
    System.Double addOne(System.Double x);

    [OperationContract(Name = "addOne_5")]
    System.Double[] addOne(System.Double[] x);

    [OperationContract(Name = "addOne_6")]
    System.Double[][] addOne(System.Double[][] x);
}

using System;
using System.Text;
using System.ServiceModel;


namespace AdditionServer
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                using (ServiceHost host =  new ServiceHost(typeof(MechanismIAddOne)))
                {
                    host.Open();
                    Console.WriteLine("Addition Server is up running......");
                    Console.WriteLine("Press any key to close the service.");
                    Console.ReadLine();
                    Console.WriteLine("Closing service...");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ServiceModel;


namespace AdditionClient
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                // Connect to Addition Service
                Console.WriteLine("\nConntecting to Addition Service through Http connection...");

                AdditionClient.AdditionProxy.AddOneClient Addition = new AdditionClient.AdditionProxy.AddOneClient("HttpBinding");

                Console.WriteLine("\nConntected to Addition Service...\n");

                // Output as return value
                int one = 10;
                int two = Addition.addOne_1(one);
                Console.WriteLine("addOne({0}) = {1}",
                                                one, two);

                // Output: first parameter
                int i16 = 16;
                int o17 = 0;
                Addition.addOne_2(ref o17, i16);
                Console.WriteLine("addOne({0}) = {1}", i16, o17);

                // Output: second parameter
                int three = 0;
                Addition.addOne_3(two, ref three);
                Console.WriteLine("addOne({0}) = {1}",
                                              two, three);

                // Scalar doubles
                System.Double i495 = 495.0;
                System.Double third =
                                 Addition.addOne_4(i495);
                Console.WriteLine("addOne({0}) = {1}",
                                            i495, third);

                // Vector addition
                System.Double[] i = { 30, 60, 88 };
                System.Double[] o = Addition.addOne_5(i);
                Console.WriteLine(
                     "addOne([{0} {1} {2}]) = [{3} {4} {5}]",
                         i[0], i[1], i[2], o[0], o[1], o[2]);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }

            Console.WriteLine("\nPress any key to close the client application.");
            Console.ReadLine();
            Console.WriteLine("Closing client...");
        }
    }
}