https://learn.microsoft.com/ko-kr/dotnet/api/system.web.httpcontextwrapper.pageinstrumentation?view=netframework-4.8.1
HttpContextWrapper.PageInstrumentation Property (System.Web) | Microsoft Learn
Gets a reference to the page-instrumentation service instance for this request.
property systemwebmicrosoftlearn
https://learn.microsoft.com/ko-kr/dotnet/api/system.web.httpcontextwrapper.error?view=netframework-4.8.1
HttpContextWrapper.Error Property (System.Web) | Microsoft Learn
Gets the first error (if any) that accumulated when an HTTP request was being processed.
property systemerrorwebmicrosoftlearn