XAML designer is not loading in the WPF after adding a custom control, but is working fine on runtime in Visual Studio 2019

[Adesh Kishore]

In Visual Studio 2019, WPF xaml designer is not loading in the design time showing as invalid markup but while building the project and in runtime the application is running along with the custom control works fineIn the design time is giving error as Error XDG0008 The name CustomControl does not exist in the namespace clr-namespace:xxxx.xxxx.xxx;assembly=xxxVisual Studio 2019 designer error

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