using System;

public class Program

{

    public static void Main()

    {

        var c1 = new Counter();

        var c2 = new Counter();

        c1.IncrementLocal();

        c1.IncrementLocal();

        c1.IncrementGlobal();

        c2.IncrementLocal();

        c2.IncrementGlobal();

        Assert(() => c1.GetLocal() == 2);

        Assert(() => c2.GetLocal() == 1);

        Assert(() => c1.GetGlobal() == 2);

        Assert(() => c2.GetGlobal() == 2);

    }

    class Counter 

    {   

        public void IncrementLocal() {}

        public void IncrementGlobal() {}

        public int GetLocal() 

        { 

            return 0;

        }

        public int GetGlobal() 

        { 

            return 0; 

        }

    }

    private static void Assert(Func<bool> func) 

    {

        if (func())

            Console.WriteLine("Passed");

        else

            Console.WriteLine("Failed");

    }

}

​