Could not find any resources appropriate for the specified culture or the neutral culture

I just hit this same exception in a WPF project. The issue occurred within an assembly that we recently moved to another namespace (ProblemAssembly.Support to ProblemAssembly.Controls). The exception was happening when trying to access resources from a second resource file that exists in the assembly.

Turns out the additional resource file did not properly move references from the old namespace name to the new namespace name.

In the designer.cs for the resource file, there is a static property to get the ResourceManager. Within that getter, the string was still referring the old namespace. Once correcting it to the new namespace, the problem was resolved:

global::System.Resources.ResourceManager temp =      new global::System.Resources.ResourceManager(          "ProblemAssembly.Support.Properties.Stuff", typeof(Stuff).Assembly);

should have been:

global::System.Resources.ResourceManager temp =      new global::System.Resources.ResourceManager(          "ProblemAssembly.Controls.Properties.Stuff", typeof(Stuff).Assembly);

Hope this helps the next person.

I solved the problem like this:

1. Right click on your ResourceFile
2. Change the "Build Action" property Compile to "Embedded Resource"
3. Then build and run

It works perfectly.

When I tried sharing a resource.resx file from one C# project with another C# project, I got this problem. The suggestion on moving the Form class to the beginning of its file wasn't appropriate. This is how I solved it. You essentially use a link from the second project to the first, then enable regeneration of the resource.designer.cs file.

1. Delete the second project's Properties/Resources.resx file
2. Add the first project's Properties/Resources.resx file as a LINK to the Properties folder in the second project. Don't add it to the root level of the project.
3. Don't add the first project's Properties/Resources.designer.cs!
4. On the properties of the second project's Resources.resx, add ResXFileCodeGenerator as the CustomTool
5. Right click on the Resources.resx and select "Run Custom Tool". This will generate a new designer.cs file.

Note: I would avoid editing the resource.designer.cs file, as this is autogenerated.