[2.0] Cancelling Backgroundworker operation

In playing around with the BackgroundWorker, searching for examples on how to cancel it, I have come across this:

c# Code:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
           
            for (int i = 0 ; i < 100 ; i++)
            {
                lock (backgroundWorker1)
                {
                    if (backgroundWorker1.CancellationPending)
                    {
                        e.Cancel = true;
                        break;
                    }
                }
 
                System.Threading.Thread.Sleep(100);
 
                backgroundWorker1.ReportProgress(0, i);
            }
        }

The code is only doing some pointless loop, but my question is - Is the 'lock' operation necessary? Could reading the CancellationPending property at the same time CancelAsync() is called without locking the worker object cause a problem perhaps?

I haven't seen this used anywhere else in the other examples I have found, so just looking for some opinions.

Thanks.