I modified the regex for allowable method names to include _ for C# and re-ran an analysis on the same code. The minor issue count is correct, but it does not show the delta. It shows 0. Clicking on the minor link shows the correct delta as you can see:
C# [csharp] 4.0 Enable analysis and reporting on C# projects.
CSS [css] 1.1 Enables analysis of CSS files.
TFS [scmtfs] 2.0-SNAPSHOT TFS SCM Provider.
Web [web] 2.3 Analyze HTML (also within PHP/Ruby/etc. templates) and JSP/JSF code.