diff --git a/runtime/compiler/cs.vim b/runtime/compiler/cs.vim
new file mode 100644
index 0000000..5b75d6d
--- /dev/null
+++ b/runtime/compiler/cs.vim
@@ -0,0 +1,19 @@
+" Vim compiler file
+" Compiler:	ms C#
+" Maintainer:	Joseph H. Yao (hyao@sina.com)
+" Last Change:	2004 Mar 27
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "cs"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+" default errorformat
+CompilerSet errorformat&
+
+" default make
+CompilerSet makeprg=csc\ %