C# emacs stuff?

.emacs.d/core.el

@@ -505,6 +505,7 @@
                                    ))))
 
 (defun my-csharp-mode-hook ()
+  "My C# mode hook."
   (turn-on-font-lock)
   (c-set-style "ms-csharp"))
 
@@ -513,6 +514,10 @@
 (add-to-list 'auto-mode-alist '("\\.cool$" . csharp-mode))
 (add-to-list 'auto-mode-alist '("\\.cs$"   . csharp-mode))
 
+(eval-after-load
+ 'company
+ '(add-to-list 'company-backends 'company-omnisharp))
+
 ;; =================================================================
 ;; "XML" Support
 ;;