using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

​

public class Program

{

    public static async Task Main()

    {

        Task fetch = Task.CompletedTask;

        Console.WriteLine($"Result: {fetch.IsCompleted}");

        fetch = fetch.ContinueWith(async _ => await Task.Delay(10));

        Console.WriteLine($"Result: {fetch.IsCompleted}");

        await fetch;                

        Console.WriteLine($"Result: {fetch.IsCompleted}");

    }

}