using System;

using System.Threading;

​

public class Program

{

    private static readonly AsyncLocal<string> AsyncLocalContext = new AsyncLocal<string>();

​

    public static void Main(string[] args)

    {

        AsyncLocalContext.Value = "No surprise";

        WrapperAsync("surprise!");

        Console.WriteLine("Main: " + AsyncLocalContext.Value);

        WrapperWrapperAsync("surprise new!");

         Console.WriteLine("Main: " + AsyncLocalContext.Value);

    }

​

    private static async void WrapperAsync(string text)

    {

        Console.WriteLine("WrapperAsync before: " + AsyncLocalContext.Value);

        AsyncLocalContext.Value = text;

        Console.WriteLine("WrapperAsync after: " + AsyncLocalContext.Value);

    }

    private static async void WrapperWrapperAsync(string text)

    {

        Console.WriteLine("WrapperWrapperAsync before: " + AsyncLocalContext.Value);

        AsyncLocalContext.Value = text;

        Console.WriteLine("WrapperWrapperAsync after: " + AsyncLocalContext.Value);

        WrapperAsync("What a hell!!!");

    }

}