Winforms: https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.dialogresult?view=netframework-4.8 Of course that matters if I am writing winforms or not.
I use the one needed in the ui framework I am using.
They made it so that all you have to remember MessageBox.Show in either ui framework.
I am working in dailies to get the application model working. If anyone has been working on that, or is interested, let me know.
My status, it requires some extra stuff in the project file, but when we got that straight, we found a bug on something missing in the runtime. That is in PR and should be in daily builds next week.