using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.Concurrent;
using System.Reflection;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;

Console.WriteLine("before");
Console.WriteLine($"first:{Counter.Next()}");
Console.WriteLine($"second:{Counter.Next()}");
static class Counter
{
    private static int value;
    static Counter() { Console.WriteLine("init"); value = 2; }
    public static int Next() => ++value;
}