await thread id test

AwaitTest.cs

using System.Threading;
using System.Threading.Tasks;
using System;
class C1
{
    public static async Task Main()
    {
        static async Task Hoge()
        {
            Console.WriteLine($"Hoge: 1: {Thread.CurrentThread.ManagedThreadId}");
            await Task.Delay(100);
            Console.WriteLine($"Hoge: 2: {Thread.CurrentThread.ManagedThreadId}");
        }
        static async Task Piyo()
        {
            Console.WriteLine($"Piyo: 1: {Thread.CurrentThread.ManagedThreadId}");
            await Task.Delay(100);
            Console.WriteLine($"Piyo: 2: {Thread.CurrentThread.ManagedThreadId}");
        }
        Console.WriteLine($"main: 1: {Thread.CurrentThread.ManagedThreadId}");
        var t1 = Hoge();
        Console.WriteLine($"main: 2: {Thread.CurrentThread.ManagedThreadId}");
        var t2 = Piyo();
        Console.WriteLine($"main: 3: {Thread.CurrentThread.ManagedThreadId}");
        await t1;
        Console.WriteLine($"main: 4: {Thread.CurrentThread.ManagedThreadId}");
        await t2;
        Console.WriteLine($"main: 5: {Thread.CurrentThread.ManagedThreadId}");
    }
}

result.txt

main: 1: 1
Hoge: 1: 1
main: 2: 1
Piyo: 1: 1
main: 3: 1
Piyo: 2: 9
Hoge: 2: 8
main: 4: 8
main: 5: 8