Usage for monadic Future in C#

ExampleFutureUsage.cs

using System;
using System.Threading;
using XSharpx;
using System.Collections;
using System.Net;

namespace TestProj
{
    class MainClass
    {
        public static void Main (string[] args)
        {


                Console.WriteLine ("Total Page size for search engines");
                var c = new CountdownEvent(1);
		
		//all calls happening concurrently
		var googPF = GetPageFuture ("http://www.google.com");
		var bingPF = GetPageFuture ("http://www.bing.com");
		var ddgPF  = GetPageFuture ("http://www.duckduckgo.com");
                
                //now we sequence the results in an easy to read fashion wihtout callbacks
                var totalPageSize = 
			from googlePage in googPF
			from bingPage   in bingPF
			from ddgPage    in ddgPF
				select googlePage.ToCharArray().Length + bingPage.ToCharArray().Length + ddgPage.ToCharArray().Length;
			

	        totalPageSize.Map (s => {
				Console.WriteLine ("Total size is = " + s);
				return c.Signal();

		});

             
                Console.WriteLine ("At the end of main");
                c.Wait();

        }

	public static Future<String> GetPageFuture (String str)
	{
		return Future.Create (()=>GetPage (str));
	}

	public static String GetPage (String str)
	{
		var ret = "";
		using (var client = new WebClient()) {
			ret = client.DownloadString (str);
	        }
		return ret;
	}
    }
}

Some sample (possible) implementations.

https://github.com/vmarquez/xsharpx/tree/master/src/XSharpx/Promise.cs

https://github.com/vmarquez/xsharpx/blob/master/src/XSharpx/Future.cs