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If youre using Microsoft.VisaulBasic, youre suppose to be able to use ProjectData, but I cant. Any suggestions?

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Dani AI

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Short answer: do not re-declare the helper type yourself. pointed toward the official docs; , the snippet you posted won’t create the runtime support the compiler/runtime already provides.

Fix checklist and practical steps:

  • If this is a Visual Basic project there is usually nothing to add; the VB runtime helpers are referenced by default.
  • If this is a C# (or other) project, add a reference to the Visual Basic runtime and import the compiler-services namespace so the helper type becomes available. In Visual Studio use References → Add Reference → Assemblies → Framework → Microsoft.VisualBasic. For SDK-style or modern CLI projects you can add the package and then import the namespace.
dotnet add package Microsoft.VisualBasic

using Microsoft.VisualBasic.CompilerServices;

Troubleshooting tips:

  • If you still get “type or namespace name … could not be found,” check the project’s Target Framework and that the Microsoft.VisualBasic reference appears in the project file.
  • On newer runtimes verify the runtime/package actually includes the same APIs you expect; implementation and availability can differ by framework/version.

Caution: the helper type is meant for Visual Basic compiler/runtime support. Prefer standard, language-level error handling and APIs rather than depending on compiler helper methods for cross-language or long-term code. Official API details are on the Microsoft docs: ProjectData class documentation.

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Where should I add this? In a class?


private sealed class ProjectData;

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