using System;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        typeof(Demo)

            .GetField("_intValue",BindingFlags.Static | BindingFlags.NonPublic)

            .SetValue(null,567);

        Console.WriteLine(Demo.GetValue);

    }

    static class Demo

    {

        private readonly static int _intValue;

        static Demo()

        {

            _intValue = 5;

        }

        public static int GetValue {get { return _intValue; } }

    }

}