using System;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Main:-" + A.value + "-");

        Task t1 = Task.Run(() => A.go());

        Task t2 = Task.Run(() => A.go());

        Task t3 = Task.Run(() => A.go());

        Task.WaitAll(t1, t2, t3);

    }

}

​

public class A

{

    [ThreadStatic]

    public static int value = 10;

    public static void go()

    {

           value++;

        Console.WriteLine("-"+value+"-");

    }

}

​