My ASP WebForms Projects are not scanned by sonarqube

You can see what files are marked as source in <PROJECT_GUID>.sonar.sources=\ in the END_OUTPUT logs. I don’t see any mention for the project you mention UDIT.WKD.EKMv3.WebApp in the END step.

I see in the logs a reference to VisualStudio2010. You need to use MSBuild.exe that comes with Visual Studio 2015 Update 3 (or Visual Studio 2017 any update) (see similar thread and also this solution from another thread).

You should also use the latest Scanner for MSBuild, it may fix issues.