Waits for the cancellable System.Threading.Tasks.Task to complete execution.
- millisecondsTimeout
- The number of milliseconds to wait, or System.Threading.Timeout.Infinite (-1) to wait indefinitely.
- cancellationToken
- A TaskFactory.CancellationToken to observe while waiting for the task to complete.
true if the System.Threading.Tasks.Task completed execution within the allotted time; otherwise, false.