Proper way of cancel execution of a method [duplicate]

Answer 1

try using cancellation token by specifying it your function in task http://blogs.msdn.com/b/csharpfaq/archive/2010/07/19/parallel-programming-task-cancellation.aspx

CancellationTokenSource tokenSource = new CancellationTokenSource();
 Task.Factory.StartNew( () => {
    // Do work
    onCompleteCallBack(someResult);
  }, tokenSource.Token);

private void cancel_Click(object sender, RoutedEventArgs e)
{
    tokenSource.Cancel();

}