People have asked about this.  This is the regular expression I use to allow emacs' next-error function to handle csc error messages.  It is included in the emacs.el that I published previously.  Here it is excerpted for convenience.

;; to allow next-error to work with csc.exe: 
(setq compilation-scroll-output t)
(setq-default compilation-error-regexp-alist
;       (append 
 '(
 ; Microsoft VJC:
 ;sample.java(6,1) : error J0020: Expected 'class' or 'interface'
 ("\\(\\([a-zA-Z]:\\)?[^:(\t\n]+\\)(\\([0-9]+\\)[,]\\([0-9]+\\)): \\(error\\|warning\\) VJS[0-9]+:" 1 3 4)

 ;; dinoch - Wed, 04 Aug 2004  09:29
 ;; handle whitespace at beginning of line (for nant output)
 ;; 
 ;C# Compiler
 ;t.cs(6,18): error SC1006: Name of constructor must match name of class
 ;
 ("[ \t]*\\(\\([_a-zA-Z:\]:\\)?[^:(\t\n]+\\)(\\([0-9]+\\)[,]\\([0-9]+\\)): \\(error\\|warning\\) CS[0-9]+:" 1 3 4)

 ; Microsoft C/C++:
 ;  keyboard.c(537) : warning C4005: 'min' : macro redefinition
 ;  d:\tmp\test.c(23) : error C2143: syntax error : missing ';' before 'if'
 ;VC EEi
 ;e:\projects\myce40\tok.h(85) : error C2236: unexpected 'class' '$S1'
 ;myc.cpp(14) : error C3149: 'class System::String' : illegal use of managed type 'String'; did you forget a '*'?
    ("\\(\\([a-zA-Z]:\\)?[^:(\t\n]+\\)(\\([0-9]+\\)) \
: \\(error\\|warning\\) C[0-9]+:" 1 3)
 )
;;  compilation-error-regexp-alist)
)