using System;

public class Program

{

    private sealed class Foo

    {

        public int X;

        public void InstanceMethod()

        {

            Console.WriteLine(this.X); //null reference exception!

        }

    }

    public static void Main()

    {

        ((Action<Foo>)Delegate.CreateDelegate(typeof(Action<Foo>), null, typeof(Foo).GetMethod("InstanceMethod")))(null);

    }

}