Recently been working on a multiple languages web site, support French, German, Chinese, English...
One thing needs to be aware of, when you try to load the resource manager, be sure to use the following command

ResourceManager sr = new ResourceManager(AssemblyNameSpace + "resource foldername" + "." + "resource filename", this.GetType().GetAssembly).

In msdn, it is only telling you to use assembly+resource filename, and it is not working...