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Pro WF: Windows Workflow in .NET 4 by Bruce Bukovics

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The focus of this chapter is direct communication between the host application and a workflow instance. The chapter begins with an overview of long-running workflows and the bookmark mechanism used to implement them. Bookmarks provide a way to temporarily suspend execution of a workflow instance while it is waiting for external input. They also provide a way to pass data to a waiting instance as the bookmark is resumed.

But bookmarks only permit data to be passed into a workflow instance, not in the other direction to the host application. The use of workflow extensions for sending data to a host application is discussed and demonstrated next. ...

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