using System.Activities;
namespace UseBookmark{
    public class MyReadLine : NativeActivity<string>{
        [RequiredArgument]
        public InArgument<string> BookmarkName { get; set; }
        protected override void Execute(
            NativeActivityContext context)
        {
            context.CreateBookmark(BookmarkName.Get(context),
                     new BookmarkCallback(OnResumeBookmark));
        }
        protected override bool CanInduceIdle
        {
            get
            {
                { return true;}
            }
        }
        public void OnResumeBookmark(
            NativeActivityContext context,
            Bookmark bookmark,
            object obj)
        {
            Result.Set(context, (string)obj);
        }
    }
}

using System;
using System.Linq;
using System.Activities;
using System.Activities.Statements;
using System.Threading;

namespace UseBookmark{
    class Program{
        static void Main(string[] args)
        {
            AutoResetEvent syncEvent = 
                new AutoResetEvent(false);
            string bookmarkName="GreetingBookmark";
            WorkflowApplication wfApp = 
                new WorkflowApplication(new Workflow1()
            {
                BookmarkNameInArg=bookmarkName
            });
            wfApp.Completed = delegate(
                WorkflowApplicationCompletedEventArgs e)
            {
                syncEvent.Set();
            };
            wfApp.Run();
            wfApp.ResumeBookmark(bookmarkName, 
                Console.ReadLine());
            syncEvent.WaitOne();
        }
    }
}