using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        thinger();

        Thread.Sleep(1500);

        Console.WriteLine("Program ending");

    }

    public static async Task thinger() {

        using var cancellationSource = new CancellationTokenSource();

        TimeSpan timeSpan = TimeSpan.FromSeconds(1);

        cancellationSource.CancelAfter(timeSpan);

​

        try

        {

            Console.WriteLine("start delay");

            await Task.Delay(timeSpan, cancellationSource.Token);

            Console.WriteLine("end delay");

        }

        catch (Exception e)

        {

            Console.WriteLine($"{e.GetType().Name}::  {e.Message}");

        }

    }

}