Are there official MIME types for the .cs (C# source), .resx, .aspx, etc. files in a .NET project?
If no official types are defined, any recommendations on good MIME types? This will be exposed via Apache and the mod_dav_svn
module when viewing a Subversion repository from a web browser, so anything that'll help Firefox et al render the file correctly would do the trick.
Apparently Gnome uses text/x-csharp for C# source files, but I'd personally expect .cs and .aspx files to be text/plain and .resx to be text/xml.
Use the information on this answer to easily determine the MIME types.
For example (running on Windows XP SP2) I got the following results: