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Note

In this introductory chapter, I don’t dig into the details of building state machine workflows. Consult the

.NET Framework 3.5 SDK documentation for further information if you are interested.

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WF Assemblies, Namespaces, and Projects

From a programmer’s point of view, WF is represented by three core assemblies:

• System.Workflow.Activities.dll: Defines the intrinsic activities and the rules that drive

them

• System.Workflow.Runtime.dll: Defines types that represent the WF runtime engine and

instances of your custom workflows

• System.Workflow.ComponentModel.dll: Defines numerous types that allow for design-time

support of WF applications, including construction of custom designer hosts

While these assemblies define a number of .NET namespaces, many of them are used behind

the scenes by various WF visual design tools. Table 26-3 documents some key WF-centric name-

spaces to be aware of.

Table 26-3.

Core WF Namespaces