eclipse xtext and C#

Hi people. :)

I've been learning Eclipse RCP for the past 1 or 2 weeks along with XTEXT.

:confused: I'm wondering if there's any *.xtext grammar dsl file over the Internet that I could use to establish an xtext editor with code completion over C# and the .Mono project framework.

Any relevant info that could be of use would very much appreciated.

P.S. If you also know :rolleyes: of any good Eclipse RCP oriented or general Eclipse forum aside the official one, please let me know as well.

Thank you in advance.