title: Add query values to an asp Link Button
body: <p>I have this Link Button here.</p>
  
  <pre><code>&lt;li&gt;&lt;asp:LinkButton ID="MyPDF" OnClick="Download_Click" runat="server" Text="My PDF" NavigateUrl='&lt;%# "./DownloadableProducts.aspx?filename=MyPDF" %&gt;'&gt;&lt;/asp:LinkButton&gt;&lt;/li&gt;
  </code></pre>
  
  <p>And it doesn't work, it says "could not find file". I know it's the query string because when I put the path to the file manually, it works like a charm.</p>
  
  <p>I have also tried this:</p>
  
  <pre><code>&lt;li&gt;&lt;asp:LinkButton ID="MyPDF" OnClick="Download_Click" runat="server" Text="My PDF" NavigateUrl='&lt;%# "./DownloadableProducts.aspx?filename=" + Eval("ID") %&gt;'&gt;&lt;/asp:LinkButton&gt;&lt;/li&gt;
  </code></pre>
  
  <p>and it didn't work :(</p>