AsyncCompletedEventArgs Provides data for the MethodNameCompleted event.

 AsyncOperation Tracks the lifetime of an asynchronous operation.

 BackgroundWorker Executes an operation on a separate thread.

 DoWorkEventArgs Provides data for the event handler.

 ProgressChangedEventArgs Provides data for the event.

 RunWorkerCompletedEventArgs Provides data for the MethodNameCompleted event.

 AsyncOperationManager Provides concurrency management for classes that support asynchronous method calls. This class cannot be inherited.