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Home/ Questions/Q 9229921
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Editorial Team
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Editorial Team
Asked: June 18, 20262026-06-18T05:41:36+00:00 2026-06-18T05:41:36+00:00

When I try to build a project I have this mistake: The name ‘F7Utils’

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When I try to build a project I have this mistake:

The name 'F7Utils' does not exist in the current context

I’ve got this mistake whenever I try to build my WPF project. F7Utils, as its name says, is a private library that I created by myself. And I refer it in my project. So, as it’s referred, I don’t understand what’s happening…

This is my structure:

enter image description here

And this how I call it:

String a = F7Utils.Nullable.NullValue.String;

And then it launches the error.

Any suggestion?

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  1. Editorial Team
    Editorial Team
    2026-06-18T05:41:37+00:00Added an answer on June 18, 2026 at 5:41 am

    That error can occur if your library doesn’t use F7Utils as the namespace for the Nullable type. This can also happen if your types are not public within your library.

    On a side note, I would recommend not using the same type names as framework types, such as Nullable, as this will just cause your code to be less maintainable.

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