[Designer(typeof(CompositeDesigner))]
    public class MyCompsiteActivity : NativeActivity
    {

        public Variable<int> Index = new Variable<int>();

      public Activity DoWhileActivity { get; set; }
        public MyCompsiteActivity()
        {

            DoWhileActivity = CreateDoWhile();
        }

        protected override void CacheMetadata(NativeActivityMetadata metadata)
        {



            metadata.AddChild(DoWhileActivity);

            metadata.AddImplementationVariable(this.Index);

            base.CacheMetadata(metadata);
        }

        protected override void Execute(NativeActivityContext context)
        {
            context.ScheduleActivity(this.DoWhileActivity, onActivityCompleted);
            //ScheduleActivities(context);
            
        }

        void ScheduleActivities(NativeActivityContext context)
        {

        }
        void onActivityCompleted(NativeActivityContext context, ActivityInstance instance)
        {
            ScheduleActivities(context);
        }

        private Activity CreateDoWhile()
        {
            Variable<bool> VResult = new Variable<bool>("VResult", false);
            return new DoWhile()
            {
                DisplayName = "DoWhile",
                Variables = { VResult },
                Condition = ExpressionServices.Convert<bool>(env => VResult.Get(env)),
                Body = new Sequence()
                {
                    DisplayName = "DoWhile Body",
                    Activities = 
                    {
                        new If()
                        {
                            DisplayName = "If Then Else",
                            //Code to be added here in Level 2
                            Condition = ExpressionServices.Convert<bool>(env => VResult.Get(env)),
                            Then = new IFThenActivity() { DisplayName="Set Resut True", InOutResult=VResult},
                            Else = new IFElseActivity(){ DisplayName="Double Click End Key"}
                        }
                    }

                }
            };
        }
    }

    public sealed class IFElseActivity : CodeActivity
    {
      
        protected override void Execute(CodeActivityContext context)
        {
            Console.WriteLine("Double Press End Keys!");
        }
    }

  public sealed class IFThenActivity : CodeActivity
    {
        public InOutArgument<bool> InOutResult { get; set; }
        protected override void Execute(CodeActivityContext context)
        {

            Console.WriteLine("Set InOutResult True!");

            bool s1 = context.GetValue(this.InOutResult);
            Console.WriteLine("Preset is :"+s1);
            context.SetValue(this.InOutResult, true);
            Console.WriteLine("Postset is :" + s1);
        }
    }