Hello, I’m working on localizing my custom DNN module (C#, ASP.NET).

👉 I’m following the standard approach:

• I created App_LocalResources/View.ascx.resx and View.ascx.fr-FR.resx

• The files contain a key:

<data name="msg" xml:space="preserve">
  <value>Congrats !!</value>
</data>

My code:

string resourceFile = this.TemplateSourceDirectory + "/App_LocalResources/View.ascx";

string message = Localization.GetString("msg", resourceFile);

lblMessage.Text = message ?? "Key not found";

or

lblMessage = Localization.GetString("msg", this.LocalResourceFile);

• The current culture is fr-FR (I forced it in code for testing).

✅ The resource files are in the right folder.
✅ The key exists and matches exactly.
✅ The file name matches (View.ascx.fr-FR.resx).

❌ **But Localization.GetString always returns null.

What I checked:**

• The LocalResourceFile is correct: /DesktopModules/MyModule/App_LocalResources/View.ascx

• I cleared the DNN cache and restarted the app pool

• File encoding is UTF-8

• Permissions on the .resx file are OK

My question:
➡ Does anyone have a working example where Localization.GetString reads App_LocalResources successfully without modifying the web.config (i.e. without re-enabling buildProviders for .resx)?
➡ Could there be something else blocking DNN from loading the .resx files (for example, a hidden configuration or DNN version issue)?

Thanks for your help!