using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var obj1 = new Foo();

        var obj2 = (iFoo) new Foo();

        DoSomething(obj1);

​

        DoSomething(obj2);

    }

    public static void DoSomething(object o)

    {

        Console.WriteLine("o.objType: " + o.GetType());

    }

    public interface iFoo

    {

        int Val{get;set;}

    }

    public class Foo : iFoo

    {

     public int Val {

        get{ return 123;}

        set { Val = value;}

     }

    }

}