当任务发生时会发生什么'；s已取消

我在玩Await/Async和CancellationTokens。我的代码是有效的，但是当任务被取消时会发生什么？它是否仍在占用资源，还是被垃圾收集？

这是我的代码：

    private CancellationTokenSource _token = new CancellationTokenSource();
    public Form1()
    {
        InitializeComponent();
    }
    async Task<String> methodOne()
    {
        txtLog.AppendText("Pausing for 10 Seconds 'n");
        var task = Task.Delay(10000, _token.Token);
        await task;
        return "HTML Returned. 'n";
    }
    private async void button1_Click(object sender, EventArgs e)
    {
        try
        {
            var task1 = methodOne();
            await task1;
            txtLog.AppendText(task1.Result + "'n");
            txtLog.AppendText("All Done 'n");
        }
        catch (OperationCanceledException oce)
        {
            txtLog.AppendText("Operation was cancelled");
        }
    }
    private void button2_Click(object sender, EventArgs e)
    {
        _token.Cancel();
    }