Windows Forms
A set of .NET Framework managed libraries for developing graphical user interfaces.
1,388 questions
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It's activated in toolbox and I still can't use it
.NET 5 isn't .NET Framework, I suspect you need to install a NuGet package, maybe this one? https://www.nuget.org/packages/System.windows.forms.datavisualization
May I know whether your issue have been solved or not? if not, please share it here, we can work together to figure it out.
Sorry for late answer, yes, it was solved