Task the new way to parallel jobs, a replacement for BackgroundWorker

Task class is an improvement version for BackgroundWorker. It supports nesting (parent/child tasks), new cacellation API, task continuations, etc. The following website is an example to compare Task and BackgroundWorker.

References: 

• Reporting Progress from Tasks
• Task parallel library replacement for BackgroundWorker?
• Continuation Tasks
• Parallel Programming: Task Schedulers and Synchronization Context