Classes Residing in App_Code Is Not Accessible

Classes residing in App_Code is not accessible

Right click on the .cs file in the App_Code folder and check its properties.

Make sure the "Build Action" is set to "Compile".

Class in App_Code folder not accessible in vb.net website project

After many painful hours i've finally got the code running - mostly thanks to the efforts of my colleagues and my boss. It seems the existing project wouldn't run for me so my boss created a new project and added the required websites to that. After some fiddling with the configuration he got it working.

So unfortunately I cannot provide an answer. Apologies if you've arrived here looking for one. I'm not sure this is actually an issue anyway as I never found anything about anyone else having the problem.

Thanks to Albert D. Kallal for trying to help

Unable to access class from app_code

In a nutshell, you cannot access page classes from App_code classes.

This restriction comes from website project compilation model. Special App_code folder contains shared classes (and possibly other resources) which are available to pages (and to each other). During compilation App_code is compiled first in a single assembly. This is the key point. Pages, controls and MasterPages are compiled in another assembly(ies) which may have references to the App_code assembly (but not vise versa). So this is one-way road.

No namespace declaration should circumvent this behavior.

Pages can see each other in ASP namespace (ASP.default_aspx) but pages usually don't have public properties / methods (user controls .ascx usually have).

Read better explanation on MSDN Code-Behind Pages

Class in App_Code not accessible

I think your App_Code folder is not in root folder of project. Please make sure that you have put App_code folder in project path which contains default.aspx file. Don't keep App_code within a nested folder.

Unable to call App_Code class from a code-behind

Change your class' Build Action to Compile.

Accessing a Class that is NOT declared in App_Code in ASP.NET

I assume you mean you are defining a separate class inside the codebehind .cs file? What access modifiers are you giving them?

As above though, I'd generally have a separate project in the solution for this kind of thing (usually in a different namespace like MyApp.Web and MyApp.), and just reference it from there.

App_Code class not being recognized

Make sure Build Action is set to Compile on File Properties.

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