Classes residing in App Code is not accessible

Question

I have created a website in ASP NET and have created a class and put it inside of the App Code folder  However I cannot access this from my other pages  Does something need to be configured to allow this  I have made it work in previous projects  but not in this one  somehow   namespace CLIck10 App Code       public static class Glob

User · Answer

Put this at the top of the other files where you want to access the class:

using CLIck10.App_Code;

OR access the class from other files like this:

CLIck10.App_Code.Glob

Not sure if that's your issue or not but if you were new to C# then this is an easy one to get tripped up on.

Update: I recently found that if I add an App_Code folder to a project, then I must close/reopen Visual Studio for it to properly recognize this "special" folder.

User · Answer

Right click on the  cs file in the App Code folder and check its properties    Make sure the  Build Action  is set to  Compile

User · Answer

Go to the page from where you want to access the App code class  and then add the namespace of the app code class  You need to provide a using statement  as follows   using WebApplication3 App Code    After that  you will need to go to the app code class property and set the  Build Action  to  Compile

User · Answer

I haven t figured out yet why this occurs  but I had classes that were in my App Code folder that were calling methods in each other  and were fine in doing this when I built a  NET 4 5 2 project  but then I had to revert it to 4 0 as the target server wasn t getting upgraded   That s when I found this problem  after fixing the langversion in my web config from 6 to 5    another story       One of my methods kept having an error like    The type X Y conflicts with the imported type X Y in MyProject DLL   All of my classes were already set to  Compile  in their properties  as suggested on the accepted answer here  and each had a common namespace that was the same  and each had using MyNamespace  at the top of each class   I found that if I just moved the offending classes that had to call methods in each other to another  standard folder named something other than  App Code   they stopped having this conflict issue     Note   If you create a standard folder called  AppCode   move your classes into it  delete the  App Code  folder  then rename  AppCode  to  App Code   your problems will return   It doesn t matter if you use the  New Folder  or  Add ASP  NET Folder  option to create  App Code  - it seems to key in on the name   Maybe this is just a  NET 4 0  and possibly earlier  issue    I was just fine in 4 5 2 before having to revert

User · Answer

make sure that you are using the same namespace as your pages

User · Answer

In my case  I couldn t get a project to build with classes defined in the App Code folder   Can t replicate the scenario precisely to comment  but had to close and re-open visual studio for intellisense to co-operate agree     I noticed that when a class in the App Code folder is set to  Compile  instead of  Content   right-click it  that the errors were coming from a second version of the class    Look to the left-most of the 3 of the 3 fields between the code pane and the tab  The  other  one was called something along the lines of 10 App Code or similar   To rectify the issue  I renamed the folder from App Code to Code  explicitly set namespaces on the classes and set all of the classes to  Compile

User · Answer

I found it easier to move the files into a separate Class Library project and then reference that project in the web project and apply the namespace in the using section of the file  For some reason the other solutions were not working for me  but this work around did

[c#] Classes residing in App_Code is not accessible

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