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Home/ Questions/Q 9071367
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Editorial Team
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Editorial Team
Asked: June 16, 20262026-06-16T17:53:36+00:00 2026-06-16T17:53:36+00:00

I added using Microsoft.VisualBasic to my code but compiler reports error CS0234: The type

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I added using Microsoft.VisualBasic to my code but compiler reports error CS0234:

The type or namespace name ‘FileSystem’ does not exist in the namespace ‘Microsoft.VisualBasic’ (are you missing an assembly reference?)

What is this “assembly reference” and how to add one?

Error also shown in the picture
http://img16.imageshack.us/img16/6517/errorcup.jpg

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  1. Editorial Team
    Editorial Team
    2026-06-16T17:53:37+00:00Added an answer on June 16, 2026 at 5:53 pm

    You’ve got a using directive for the Microsoft.VisualBasic namespace, but the fact that you’re fully-qualifying the name Microsoft.VisualBasic.FileSystem makes that irrelevant.

    I suspect you just haven’t added a reference to the Microsoft.VisualBasic.dll assembly. (Assemblies and namespaces are very different things.)

    Personally I would attempt to avoid VB-specific assemblies in the first place, to be honest.

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