title: ASP.NET HiddenField Value Setting
body: <p>I have googled this, but can't figure out how to set the value of my hidden field.  I have the following code:</p>
  
  <pre><code>&lt;asp:HiddenField id="fileId" runat="server" value="&lt;%# Response.Write(Request.QueryString["fileID"]) %&gt;" /&gt;
  </code></pre>
  
  <p>I am just trying to make the value = the value of <code>fileID</code> in the query string.</p>
  
  <p>Thanks for your help.</p>