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Editorial Team
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Asked: 2026-05-11T16:10:21+00:00

Can I somehow utilize the App_code folder in a web application project to compile

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Can I somehow utilize the App_code folder in a web application project to compile code on the fly? It’d be great for plugins. Recently Rob Conery demonstrated its use in his talk at MIX 09 in a ASP.NET MVC app. I tried to do the same in a web app but I can’t access the classes under App_Code from anywhere else. But if Rob was able to do it in an MVC app, it should be doable in a web application too. After all ASP.NET MVC IS a ASP.NET Web Application under the covers.

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  1. Editorial Team

    If you add a code file to the App_Code folder, it should be compiled and available from a code-behind file for a control, or another code file in the App_Code file.

    I don’t think you’ll be able to access it directly from a compiled assembly, since the compiler won’t be able to find that reference at compile time.

    You’ll also need to be aware that App_Code is compiled into a different assembly than your code-behind code, so you can’t access internal code across the different assemblies.

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