After strong naming a private assembly, if i change the content/version I dont get any error!

I created a strong naming key pair MyKey.snk using sn utility.
I strong named my assembly Hello(in the name space Greet) using that keyfile by setting it in the signing tab of the project properties.

I m using this strong named assembly in another console appln ConsoleExe as:

using System;
using System.Collections.Generic;
using System.Text;
using Greet;

namespace ConsoleExe
{
 class Program
 {
  static void Main(string[] args)
  {
   Hello h = new Hello();
   h.sayHello();
   Console.ReadLine();
  }
 }
}

Now i change the content/version of Hello class and compile it.

Then try to run ConsoleExe(Ctrl+F5), i should get an error right.. saying the version CLR is looking for is not present!!! But I dont get any error.It runs fine.how  s this possible?!?!