private int n1, n2;

private void FirstCall()
{
  Service.GetRandomNumber(10, SecondCall);
}

private void SecondCall(int number)
{
  n1 = number;
  Service.GetRandomNumber(n1, ThirdCall);
}

private void ThirdCall(int number)
{
  n2 = number;
  // etc
}

private void FetchNumbers()
{
 int n1 = Service.GetRandomNumber(10);
 int n2 = Service.GetRandomNumber(n1);
}

private void FetchNumbers()
{
  int n1, n2;

  Service.GetRandomNumber(10, result =>
                                  {
                                      n1 = result;
                                      Service.GetRandomNumber(n1, secondResult =>
                                                                      {
                                                                          n2 = secondResult;
                                                                      });
                                  });
}

using System;
using System.Collections.Generic;
using System.Threading;

namespace CoroutinesSample
{
  class Program
  {
      static void printAll()
      {
          foreach (int x in integerList())
          {
              Console.WriteLine(x);
          }
      }

      static IEnumerable<int> integerList()
      {
          yield return 1;
          Thread.Sleep(1000);
          yield return 2;
          yield return 3;
      }

      static void Main()
      {
          printAll();
      }
  }
}

private bool MoveNext()
{
  switch (this.<>1__state)
  {
      case 0:
          this.<>1__state = -1;
          this.<>2__current = 1;
          this.<>1__state = 1;
          return true;

      case 1:
          this.<>1__state = -1;
          Thread.Sleep(0x3e8);
          this.<>2__current = 2;
          this.<>1__state = 2;
          return true;

      case 2:
          this.<>1__state = -1;
          this.<>2__current = 3;
          this.<>1__state = 3;
          return true;

      case 3:
          this.<>1__state = -1;
          break;
  }
  return false;
}

    public class Client
    {
        public delegate string Invoker();
        public static Invoker Execute;//اضافه کردن یک آیتم جدید
        public static Invoker Redo;//حرکت به جلو
        public static Invoker Undo;//حرکت به عقب
    }

    public class Command
    {
        public Command(Receiver receiver)
        {
            Client.Execute = receiver.Action;
            Client.Redo = receiver.Foreward;
            Client.Undo = receiver.Reverse;
        }
    }

    public class Receiver
    {
        private readonly List<string> build = new List<string>();
        private readonly List<string> oldBuild = new List<string>();

        public string Action()
        {
            if (build.Count > 0)
                oldBuild.Add(build.LastOrDefault());
            build.Add(build.Count.ToString(CultureInfo.InvariantCulture));
            return build.LastOrDefault();
        }

        public string Reverse()
        {
            string last = oldBuild.LastOrDefault();
            if (last == null)
                return "EMPTY";
            oldBuild.Remove(last);
            return last;
        }

        public string Foreward()
        {
            string oldIndex = oldBuild.LastOrDefault();
            int index = oldIndex == null ? -1 : build.IndexOf(oldIndex);
            if ((index + 1) == build.Count)
                return "END";
            oldBuild.Add(build.ElementAt(index + 1));
            return oldBuild.LastOrDefault();
        }
    }

            new Command(new Receiver());
            Console.WriteLine(Client.Execute());
            Console.WriteLine(Client.Execute());
            Console.WriteLine(Client.Undo());
            Console.WriteLine(Client.Undo());
            Console.WriteLine(Client.Undo());
            Console.WriteLine(Client.Redo());
            Console.WriteLine(Client.Redo());
            Console.WriteLine(Client.Redo());
            Console.WriteLine(Client.Execute());

Team Foundation Server 2015 Update 3 RC 

c:\path\nunit-console.exe /nologo $(TargetPath)

c:\path\nunit.exe $(TargetPath)

<configuration>  
<startup>  
      <supportedRuntime version="v4.0.30319" />  
</startup>  

<runtime>  
    <loadFromRemoteSources enabled="true" />  

c:\path\nunit-console.exe /xml:$(ProjectName)-tests.xml /nologo $(TargetPath)