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Home/ Questions/Q 890495
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T13:44:30+00:00 2026-05-15T13:44:30+00:00

There seem to be 2 classes that relates to workflow Activities in .NET 4:

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There seem to be 2 classes that relates to workflow Activities in .NET 4: System.Workflow.ComponentModel.Activity and System.activities.Activity

What’s the difference between the two?

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  1. Editorial Team
    Editorial Team
    2026-05-15T13:44:30+00:00Added an answer on May 15, 2026 at 1:44 pm

    The first one ("System.Activities…") is from Workflow Foundation 3.0 and the second one ("System.Workflow…") is for Workflow Foundation 4.0.

    There was a substantial rewrite (for the better imho) between the two. 3.0 workflow activities can be used in 4.0 via migration or via interop.

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