WinForms
Windows Forms (WinForms) is a UI framework for building Windows desktop applications. It is a .NET wrapper over Windows user interface libraries, such as User32 and GDI+.
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Updated
Jul 19, 2022 - C#
.NET version
6.0.6
Issue description
The ErrorProvider uses a built-in icon resource with Windows 7 styling, this looks out of place on Windows 10/11.
Ideally it should get the default system error icon from the OS using SHGetStockIconInfo.
The built-in ErrorProvider icon: 
Discussed in CommunityToolkit/WindowsCommunityToolkit#4571
Originally posted by victorchinn June 4, 2022
I am getting a XAML parsing error
Microsoft.UI.Xaml.Markup.XamlParseException: 'XAML parsing failed.'
when using this code example in the XAML for TextBox:
ui:TextBoxExtensions.SurfaceDialOptions