title: HttpContext.GetGlobalResourceObject always returns null
body: <p>I created two files in the App_GlobalResources folder:</p>
  
  <pre><code>SiteResources.en-US.resx
  SiteResources.sp-SP.resx
  </code></pre>
  
  <p>Both contain a value for "SiteTitleSeparator".</p>
  
  <p>Here is what I am trying to do (The following line always returns null):</p>
  
  <pre><code>string sep = (string)GetGlobalResourceObject("SiteResources", "SiteTitle");
  </code></pre>
  
  <p>Note, that the Culture property on the page is set.</p>
  
  <p>Answers in both VB and C# will be welcomed.</p>