Keep link:
How to raise events in ASP.Net 2.0 with the health monitoring feature
Links:
http://msdn.microsoft.com/en-us/library/system.web.management.webbaseevent.aspx
http://msdn.microsoft.com/en-us/library/system.web.management.webauditevent.aspx
http://msdn.microsoft.com/en-us/library/system.web.management.webrequestevent.aspx