using System;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        var weakReference = ForgottenTask();

        Console.WriteLine($"Before GC.Collect, IsAlive: {weakReference.IsAlive}");

        GC.Collect();

        Console.WriteLine($"After GC.Collect, IsAlive: {weakReference.IsAlive}");

    }

​

    static WeakReference ForgottenTask()

    {

        var task = new Task(() => { }).ContinueWith(_ => { });

        return new WeakReference(task);

    }

}

​