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Setting the WaitForIdle property to true result in the WorkflowInstance EnqueueItemOnIdle being called instead of the EnqueueItem.
http://msdn.microsoft.com/en-us/library/system.workflow.activities.externaldataeventargs.waitforidle.aspx
Whether the event should be raised immediately, or if the workflow should go idle before raising the event.
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A WorkflowInstance is an actual executing copy of a WorkflowDefinition.
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Waits for the target workflow to be idle before sending the message.
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Sends a message to a workflow queue
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