Why when I use ResourceReader read the resx file has error?

Question

Hello.

I want to use resx file to make a multi-language effect in my app.But when I use ResourceReader to read it, recevied ArgumentException. The message is "The stream is a incorrect resource file."(資料流不是有效的資源檔。)

This issue just on I declared the class using the code following:
  Dim CultureName As String = My.Application.UICulture.Name
 Dim res As New System.Resources.ResourceReader(CultureName & "\Resource1.resx")

The resx file I make it on VisualStudio 2008.

Thinks a lot~