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Home/ Questions/Q 6891733
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T06:26:50+00:00 2026-05-27T06:26:50+00:00

I cant use Extensibility lib in my project. Error: The type or namespace name

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I cant use Extensibility lib in my project.

Error:

The type or namespace name 'Extensibility' could not be found 

Using Visual Studio 2010, Framework 4

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  1. Editorial Team
    Editorial Team
    2026-05-27T06:26:51+00:00Added an answer on May 27, 2026 at 6:26 am

    I think you are talking about this namespace: http://msdn.microsoft.com/en-us/library/extensibility%28v=VS.100%29.aspx

    To use it, add a reference to the Extensibility assembly to your project. This assembly should exist in your GAC.

    In the future, if you don’t know which assembly to use, lookup the concrete type on the MSDN: http://msdn.microsoft.com/en-us/library/extensibility.ext_connectmode.aspx. At the top of the page, it tells you in which assembly the type resides.

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