I have a legacy ASP.NET/VB.NET WebSite. There several App_Code modules/code files that use types from common namespaces (such as the "System", etc.) included in the machine.config file.
For some reason, these modules do not recognize the included namespaces from the machine.config file. Modifications of the machine.config file have no effect on these modules anymore.
When I am creating a new ASP.NET/VB.NET WebSite project, I am unable to replicate this situation. Modifications of the machine.config file have the required effect, as expected. I assume that this issue is caused by some specific option in the WebSite Web.config file. Any hint/reference would be appreciated.