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Asked: 2026-05-11T10:55:18+00:00

Let me try to ask this question from a different angle. I noticed that

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Let me try to ask this question from a different angle.

I noticed that everytime an aspx page gets rendered in the browser using the ‘web site’ model, a random assembly gets created ‘on-the-fly’ in the Temporary ASP.NET files. Analyzing the assembly in Reflector shows that the class created for any given .aspx file is under the ‘ASP’ namespace.

So, starting with a empty ‘Temporary ASP.NET Files’ directory, I opened my ASP.NET ‘website’ in VS2008, and launched the default page. Immediately I observed that a random directory was generated inside that folder. Working my way down the path, I found 2 DLLs created: App_Code.1lywsqqz.dll, and App_Web_iohekame.dll. I assume that all the .aspx pages in the website get compiled into App_Web dll and everything in App_Code folder gets compiled into App_Code.dll.

So if my App_Code C#/VB.net files are under the ‘ASP’ namespace, and my App_Web files are created under the ‘ASP’ namespace, how come I still get an error ‘Could not load type ‘ASP.NothwindDataContext’?

Somebody said ‘you don’t need namespaces in the App_Code folder’, but I tried it without and still get ‘Could not load type ‘NorthwindDataContext”.

So what’s going on between the App_Code folder, the rest of the site, and namespaces?

EDIT: Here’s my LinqDataSource in my .aspx file:

<asp:LinqDataSource ID='LinqDataSource1' runat='server'      ContextTypeName='NothwindDataContext' EnableUpdate='True'      TableName='Categories'> </asp:LinqDataSource>

Neither ‘NorthwindDataContext’, nor ‘ASP.NorthwindDataContext’ works.

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1 Answer

  1. Types in App_Code C# source files, just like any C# file, will not be put in a specific namespace unless specifically declared by namespace Name {...} around it. So a class MyClass declared in App_Code will have the fully qualified type name MyClass. Just that.

    You can reference it in Web.config as: 'MyClass, App_Code'.

    Side note: When you are using a DBML in App_Code, the namespace of generated classes are defined in that file (look at the properties window when DBML file is open). If you specify a namespace in that file, naturally, your classes will be defined in that namespace. Note that this does not contradict with what I said above. The thing is, the LINQ data context generator processes the file and defines the classes in the specific namespace.

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