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Home/ Questions/Q 6185267
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T01:40:54+00:00 2026-05-24T01:40:54+00:00

Can I add another code file to a Windows Forms Form so that it

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Can I add another code file to a Windows Forms Form so that it appears below the form in the Solution Explorer?

  • MyWindow.cv
    • MyWindow.designer.cs
    • MyWindow.cs
    • MyWindow.Helpers.cs

If I just add another file with this name, it isn’t files below MyWindow. Moreover, it is displayed with a Form icon. My code file has grown huge, that is why I’d like to split it up.

Cheers
Matthias

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  1. Editorial Team
    Editorial Team
    2026-05-24T01:40:57+00:00Added an answer on May 24, 2026 at 1:40 am

    The correct solution would be to extract helper classes.
    But you can simply add a new class file (not a new windows forms file) and save your project. Open the csproj file in a text editor and locate the <Compile Include="yourNewFile.cs"> tag of the newly added file.
    Inside this tag, add a new tag <DependentUpon>YourParent.cs</DependentUpon>, where YourParent.cs is the file you want to put the new file under. Save the csproj file and switch back to VS and reload the project file.

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