Visual Studio does not show the Winforms designer for forms or user controls instead displays the .cs file as source code

When using Visual Studio you may find that forms and user controls don't display with the correct icon and instead display as a plain .cs source file.

Double clicking the file displays the source code behind for the form, but does not display the form or control designer.


To resolve the issue simply add a new form to the project and double click the control. This restores the project and you can delete the form.



If you look at the .csproj project file before and after it appears that the subtype attributes were missing from the and adding a form puts them back.

    <Compile Include="Controls\Automation Profiles\AutomationProfileCsvSettingsUI.cs">

      <SubType>UserControl</SubType>

    </Compile>

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