title: can I call dropdownlist selectedIndexchanged before PageLoad event?
body: <p>When changing the value in <code>dropdownlist</code>. <code>selectedIndexchange</code> should call before <code>PageLoad</code> event.</p>
  
  <p>How can I call <code>dropdownlist</code> <code>selectedIndexchanged</code> before <code>PageLoad</code> event?</p>