using System;

using System.Linq;

using System.Reflection;

using System.Threading;

​

public class Program

{

    public static void Main()

    {

        new Foo().Bar();

    }

    public class Foo

    {

        public static readonly string myImportantString;

        public Foo()

        {

            Foo.myImportantString = "Something very important";

        }

        public void Bar()

        {

            new Thread(() =>

            {

                Console.WriteLine(Foo.myImportantString); //For whatever reason myImportantString is null at the point this is being executed

            }).Start();

        }

    }

}