using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        var cancel = new CancellationTokenSource();

        var token = cancel.Token;

        cancel.Cancel();

​

        Task t1 = null;

        try

        {

            t1 = Task.Run(() => token.ThrowIfCancellationRequested());

            t1.Wait();

        }

        catch{}

        Console.WriteLine(t1.Status);

​

        try

        {

            t1 = Task.Run(() => token.ThrowIfCancellationRequested(), token);

            t1.Wait();

        }

        catch{}

        Console.WriteLine(t1.Status);

}

}