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Editorial Team
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Asked: 2026-05-15T12:47:59+00:00

I have a 3rd party .dll that I have successfully added as a reference

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I have a 3rd party .dll that I have successfully added as a reference in both a VS 2010 C# project and an F# VS 2010 project. I can view the contents in the object browser in both cases, but the F# version won’t let me “open” the library. It works fine in the C# project (with the “using” directive), and I can write a program that uses the contents of this particular .dll. I have not had any trouble with other .dlls in F#/VS 2010/.NET 4.0 on Windows 7.

Any ideas as to why this might be happening? Or how I could debug this further?

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1 Answer

  1. Editorial Team

    See what the csc.exe and fsc.exe command-lines have for the library in question (in VS, open the ‘Output Window’ after a rebuild), to see if they both have the same reference (e.g. -r:Path\Library.dll).

    And to be clear, you’re saying

    open NagLibrary

    in F# yields the error message in the title, but 

    using NagLibrary;

    in C# works and opens the namespace?

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