解決:Sys.WebForms.PageRequestManagerServerErrorException(status code 500 OR 12031)問題

頁面底部加上:
<script language="javascript" type="text/javascript">
 Sys.Application.add_load(
     function()
      {
           var form = Sys.WebForms.PageRequestManager.getInstance()._form;
           form._initialAction = form.action = window.location.href;
      }
 );
</script>