service2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
using System.Threading;

namespace WcfServiceLibrary2
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in both code and config file together.
    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
    public class myCallbackKalkulator : ICallbackKalkulator
    {
        private double result;
        private ICallbackHandler callback = null;
        public myCallbackKalkulator()
        {
            callback = OperationContext.Current.GetCallbackChannel<ICallbackHandler>();
        }

        public void Factorial(double n)
        {
            Console.WriteLine("...call of Factorial({0})", n);
            Thread.Sleep(1000);
            result = 1;
            for (int i = 1; i <= n; i++)
            {
                result *= i;
            }
            callback.FactorialCB(result);
        }

        public void CalcSomething(int sek)
        {
            Console.WriteLine("...call of CalcSomething({0})", sek);
            if (sek < 10)
            {
                Thread.Sleep(sek * 1000);
            }
            else
            {
                Thread.Sleep(1000);
            }
            callback.CalcSomethingCB("Calculations lasted " + (sek + 1) + " second(s)");
        }
    }
}