I have found the following link explaining how to display a Toast notification using C#:
However, on Step 2: Reference the APIs, the Windows.UI and Windows.Data namespaces were not available in the Add Reference wizard. I learned that it is because my project targets the .NET framework, not .NET core. I don't want to convert my entire project to .NET core because I rely on certain NuGet packages that might not be compatible.
How can I display Toast notifications from a WinForms app that targets the .NET framework? I found a nuget wrapper package, but it is for WPF applications.
EDIT: The notification should persist within Windows Action Center.