HttpModule and HttpHandler sections in IIS 7 web.config files

Moving between IIS 5/6 and IIS 7 often causes some web.config conflict between the system.web and system.webserver handler and module sections. IIS 7 expects its handlers and modules defined only in its configuration section - if you still have handlers in system.web a configuration error occurs. Here's a useful switch that lets you turn off validation of system.web handlers and modules so you can ship web.config files that contain both.