diff -U 2 -Nr doxygen.old/src/configoptions.cpp doxygen/src/configoptions.cpp
--- doxygen.old/src/configoptions.cpp	2010-05-07 21:37:33.000000000 +0200
+++ doxygen/src/configoptions.cpp	2010-05-26 17:15:07.073973600 +0200
@@ -317,5 +317,5 @@
                  "Doxygen has a built-in mapping, but you can override or extend it using this\n"
                  "tag. The format is ext=language, where ext is a file extension, and language\n"
-                 "is one of the parsers supported by doxygen: IDL, Java, Javascript, C#, C, C++,\n"
+                 "is one of the parsers supported by doxygen: IDL, Java, Javascript, CSharp, C, C++,\n"
                  "D, PHP, Objective-C, Python, Fortran, VHDL, C, C++. For instance to make\n"
                  "doxygen treat .inc files as Fortran files (default is PHP), and .f files as C\n"
diff -U 2 -Nr doxygen.old/src/util.cpp doxygen/src/util.cpp
--- doxygen.old/src/util.cpp	2010-05-07 21:37:33.000000000 +0200
+++ doxygen/src/util.cpp	2010-05-26 17:08:55.922450700 +0200
@@ -6376,5 +6376,5 @@
   { "java",        "c",       SrcLangExt_Java   },
   { "javascript",  "c",       SrcLangExt_JS     },
-  { "c#",          "c",       SrcLangExt_CSharp },
+  { "csharp",      "c",       SrcLangExt_CSharp },
   { "d",           "c",       SrcLangExt_D      },
   { "php",         "c",       SrcLangExt_PHP    },
@@ -6433,5 +6433,5 @@
   updateLanguageMapping(".as",    "javascript"); 
   updateLanguageMapping(".js",    "javascript");
-  updateLanguageMapping(".cs",    "c#");
+  updateLanguageMapping(".cs",    "csharp");
   updateLanguageMapping(".d",     "d");
   updateLanguageMapping(".php",   "php"); 
