How to track and audit every call to web service

I have an webservice.sln and one of my application call that web methods in many of the asmx.cs files in the webservice.sln Say (Save and Update Web Methods in each of the asmx.cs pages). I want to audit these method calls. Is there a generic way to put this audtitMethod() instead of putting it in all the Save and Update methods IN EACH ASMX.CS FILES?