CancellationTokenIntro.AsyncFactory.GetIntAsync C# (CSharp) Method

        public static Task<int> GetIntAsync(
            CancellationToken token = default(CancellationToken)) {

            var tcs = new TaskCompletionSource<int>();

            if (token.IsCancellationRequested) {
                tcs.SetCanceled();
                return tcs.Task;
            }

            var timer = new System.Timers.Timer(2000);
            timer.AutoReset = false;
            timer.Elapsed += (s, e) => {
                tcs.TrySetResult(10);
                timer.Dispose();
            };
            
            if (token.CanBeCanceled) {

                token.Register(() => {
                    tcs.TrySetCanceled();
                    timer.Dispose();
                });
            }

            timer.Start();
            return tcs.Task;
        }
    }

        static void Main(string[] args)
        {
            CancellationTokenSource cts = new CancellationTokenSource();

            cts.CancelAfter(1000);

            AsyncFactory.GetIntAsync(cts.Token).ContinueWith((task) => {
                //We get the response.
                //So dispose the CancellationTokenSource
                //so that it is not going to signal.
                cts.Dispose();

                if (task.Status == TaskStatus.RanToCompletion)
                {
                    Console.WriteLine(task.Result);
                }
                else if (task.Status == TaskStatus.Canceled)
                {
                    Console.WriteLine("The task has been canceled.");
                }
                else
                {
                    Console.WriteLine("An error has been occurred. Details:");
                    Console.WriteLine(task.Exception.InnerException.Message);
                }
            });

            Console.ReadLine();
        }