GCTest.cs

public class Prog
{
    static void TimerHandler(object _)
    {
        Console.WriteLine("TimerHandler A");
    }


    static void SetNextTimer()
    {
        Console.WriteLine("SetNextTimer A");
        var task = Task.Delay(100);
        // note that the continuation is not awaited and nothing is keeping the Task alive from GC
        task.ContinueWith(TimerHandler, TaskScheduler.Default);
    }

    public static async Task<int> Main(string[] args)
    {
        Console.WriteLine("Main A");
        SetNextTimer();
        Console.WriteLine("Main B");
        GC.Collect();
        GC.WaitForPendingFinalizers();
        Console.WriteLine("Main C");
        await Task.Delay(200);
        GC.Collect();
        GC.WaitForPendingFinalizers();
        await Task.Delay(200);
        GC.Collect();
        GC.WaitForPendingFinalizers();
        Console.WriteLine("Main D");

        return 0;
    }
}