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

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aborting a workflow

An ungraceful and immediate teardown of a workflow instance. An aborted workflow that has been previously persisted can be loaded and resumed from its last persistence point. Aborting the workflow simply throws away everything since the last persistence point.

activity

The basic unit of composition within a workflow. An activity represents a single step in a tree of declared objects. Each activity can have its own set of input and output arguments and local variables and accomplishes some useful work.

Activity

The abstract base class for all other activity types in WF.

ActivityAction

A type-safe activity callback mechanism ...

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