title: asp.net UserControl properties
body: <p>Is it possible to access properties not defined in user control? I want to add any html attribute without defining it in codebehind.</p>
  
  <p>ex:</p>
  
  <pre><code>&lt;my:TextBox runat="server" extraproperty="extravalue" /&gt;
  </code></pre>
  
  <p>where extraporperty not defined in user control, but still generates:</p>
  
  <pre><code>&lt;input type="text" extraproperty="extravalue" /&gt;
  </code></pre>
  
  <p>I need this in custom user control. Notice the my: before the textbox.</p>
  
  <p>ty!</p>