add a one or paragraph summary or description of what's discussed here; put yours after 'Summary:'

EventArgs is the base class for classes containing event data.

Represents an event that is defined on a local service interface. An interface marked with ExternalDataExchangeAttribute must use an EventArgs type that derives from ExternalDataEventArgs in order to allow that event to be handled in workflow with a HandleExternalEventActivity.

The Handle External Event Activity activity is used in conjunction with the Call External Method Activity activity for input and output communications with a local service.

A StateWorkflow is one of the two basic workflow models included with WindowsWorkflowFoundation.

Whether the event should be raised immediately, or if the workflow should go idle before raising the event.