If you have a large ASP.NET website, you may want to turn off compilation of your non-code ASP.NET pages. You can do this by setting the CompilationMode property of the Page directive to Never. If you aren’t in the mood to check all pages, let ASP.NET decide. In the web.config file, set the CompilationMode property in the <pages /> section to Auto. This will allow ASP.NET to evaluate each page and decide whether or not it should be compiled.