RamOptimizerWinUI\RamOptimizerWinUI\Form1.Designer.vb(23)

Tommy Hale 5 Reputation points
2026-07-24T12:43:16.0033333+00:00

how do I resolve error code BC30002 in ram optimizer/winUI?

Developer technologies | Visual Basic for Applications
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  1. Nancy Vo (WICLOUD CORPORATION) 8,155 Reputation points Microsoft External Staff Moderator
    2026-07-27T03:12:33.2733333+00:00

    Hello @Tommy Hale ,

    Thanks for your question.

    Error BC30002 means a type is not recognized by the compiler. In Form1.Designer.vb at line 23, an object or control uses a type that is currently missing.

    You can refer to these following steps:

    1. Please check line 23 in Form1.Designer.vb to identify the unknown type.
    2. Add the missing reference or NuGet package to the project.
    3. Then clean and rebuild the solution.

    For additional information, you can refer to BC30002: Type typename is not defined.

    I hope this addresses your question. If this response was helpful, please consider following the guidance to provide feedback. Thank you.

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  2. AI answer

    2026-07-24T12:43:54.69+00:00

    BC30002 means a referenced type is not defined or not being resolved.

    For a Form1.Designer.vb error in a WinUI/Windows app project, check these in order:

    1. Find the missing type name BC30002 is raised when the code references a type that Visual Basic cannot find. In Form1.Designer.vb, inspect the line reported around line 23 and identify the exact type name that is underlined or named in the Error List.
    2. Verify spelling matches the declaration Make sure the type definition and the reference use the exact same spelling.
    3. Check accessibility of the type If the type is declared in another module, class, or file, ensure it is accessible. If it was declared Private, move it to the referencing module or declare it Public.
    4. Check namespace conflicts If the project redefines a namespace that matches a framework namespace, fully qualify the type with Global. The documented example is Global.System.Object when System is redefined in the project.
    5. Check project references If the missing type comes from another assembly or library, add the required reference. Visual Basic can also raise related reference errors when an assembly containing a required interface or type is not directly referenced.
    6. If this is a test project referencing a WinUI project Make sure the test project TargetFramework matches the WinUI project target framework. For example, if the WinUI project targets .NET 8 Windows, the test project should use: 
         <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
      Also update RuntimeIdentifiers as required for WinUI test projects.
    7. Clean and rebuild After fixing the missing type or reference, clean and rebuild the solution.

    If the error is specifically in designer-generated code, the practical fix is usually one of these:

    • a control or type used by the designer no longer exists,
    • a required assembly reference is missing,
    • the type is declared with the wrong access level,
    • the project has a namespace/type naming conflict.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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    1 person found this answer helpful.

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