title: asp.net HiddenField: add custom attribute dynamically
body: <p>How can I add a custom attribute to a HiddenValueField in ASP.NET? Specifically, I need a class="gmapPoint" attribute for a dynamically generated HiddenValue control. This is necessary for a JavaScript on that page</p>
  
  <pre><code>var hiddenField = new HiddenField();
  hfield.Value = "myValue";
  hfield.... Attributes["class"]
  </code></pre>
  
  <p>-- how can I do a similar thing?</p>