title: asp.net global resources error 'The resource object with key '' was not found'
body: <p>I'm using asp.net global resource to try and implement a two language website, I added a simple resource in the global resource file called <strong>en-Us.resx</strong> that contains:</p>
  
  <pre><code>Password | Text
  Email | Text
  </code></pre>
  
  <p>then implemented it to a textbox within the default page:</p>
  
  <pre><code>&lt;asp:TextBox runat="server" ID="loginEmail" Text="&lt;%$ Resources:en-US, Email %&gt;" 
                              &gt;&lt;/asp:TextBox&gt;
  </code></pre>
  
  <p>but when ever I run the page on <strong>localhost</strong> I get this error:</p>
  
  <blockquote>
    <p>The resource object with key '' was not found</p>
  </blockquote>
  
  <p>I am using asp.net 4.0, what is the problem?</p>