using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Test1().Wait();

    }

    public static AsyncLocal<string> TestStringAsync = new AsyncLocal<string>();

    public static async Task Test1() {

        // does not have a value initially (string.Empty)

        Console.WriteLine($"Test1 default value: {TestStringAsync.Value}");

        TestStringAsync.Value = "Value 1";

        // value is now Value 1

        Console.WriteLine($"Test1 set to: {TestStringAsync.Value}");

        await Test2();

        // value is still Value 1 even though Test2 set it to Value 2

        Console.WriteLine($"Test1 after calling Test2: {TestStringAsync.Value}");

    }

    public static async Task Test2() {

        // value is still Value 1, as it was inherited from parent scope

        Console.WriteLine($"Test2 before setting value: {TestStringAsync.Value}");

        TestStringAsync.Value = "Value 2";

        // value is now Value 2

        Console.WriteLine($"Test2 after setting value: {TestStringAsync.Value}");

        await Task.CompletedTask; // this is only here to get rid of compiler warning

    }

}