using OpenTK;
using StgSharp;
using StgSharp.Geometries;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Debug
{
    internal class Program
    {
        public static void Main()
        {
            A a=new A();
        }



    }

    public class A
    {
        public static int a = 10; 
        public int b = 10;
    }

    static class b
    {
        public static void change(this A a, int b)
        {
            a.b = b;
        }
    }

    static class c
    {
        public static void change(this A a, int b)
        {
            a.b = b++;
        }
    }
    

}