ASP.NET 4 Unleashed

Mixing Different Language Components in the App_Code Folder

You don’t have to do anything special if all the components in the App_Code folder are written in the same language. For example, if you use Visual Basic .NET to create all your components, the ASP.NET Framework automatically infers the language of your components and everything just works.

However, if you mix components written in more than one language in the App_Code folder—for example, Visual Basic .NET and C#—you must perform some extra steps.

First, you need to place components written in different languages in different subfolders. You can name the subfolders anything you want. The point is to not mix different language components in the same folder.

Furthermore, you need to modify ...