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How To Add Programming Languages in the App_Code Folder

The source code in the App_Code folder is compiled into a single assembly, all the files in the App_Code folder must be in the same programming language. For example, the App_Code folder cannot include source code in both Visual Basic and C#.

However, you can configure your Web application to treat subfolders of the App_Code folder as separate compilable units. Each folder can then contain source code in a different programming language. The configuration is specified by creating a codeSubDirectories element in the compilation element of the Web.config file and adding a reference to the subfolder. The following example illustrates how you would configure subfolders named VBCode and CSCode to compile into separate assemblies:

compilation debug="false">
   <codeSubDirectories>
       <add directoryName="VBCode" />
       <add directoryName="CSCode" />
   </codeSubDirectories>
</compilation>

The references to the VBCode and CSCode subfolders do not need to include any
information about what programming language is contained in the subfolder.
with the App_Code folder itself, ASP.NET infers the compiler to use based on the
files in the subfolder.

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