title: Sys.WebForms.PageRequestManager is undefined error in IE11, working fine in IE10 and below
body: <p>My clients have updated their browser to IE11 from IE10.
  I am getting below error on page refresh
  Sys.WebForms.PageRequestManager is undefined.</p>
  
  <p>Please check my code </p>
  
  <pre><code>&lt;asp:ScriptManager ID="scmMain" EnableCdn="false" runat="server" AsyncPostBackTimeout="0"
      ScriptMode="Release"&gt;
     &lt;/asp:ScriptManager&gt;
  
  &lt;script type="text/javascript"&gt;
      Sys.Application.add_init(function () {
          Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(ieAjaxPageLoaded);
          Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(ieAjaxPageLoaded);
          Sys.WebForms.PageRequestManager.getInstance().add_endRequest(ieAjaxEndRequest);
          Sys.Application.add_load(NeoSpin_PageLoad);
      });
  
      function header_onclick() {
      }
      function End(sender, args) { }
  &lt;/script&gt;
  </code></pre>
  
  <p>This works fine on IE10 and below</p>
  
  <p>I have already tried below links - but no help - </p>
  
  <p><a href="https://stackoverflow.com/questions/7062286/sys-webforms-pagerequestmanager-is-null-or-not-an-object">&#39;Sys.WebForms.PageRequestManager&#39; is null or not an object</a></p>
  
  <p><a href="https://stackoverflow.com/questions/1931701/microsoft-jscript-runtime-error-sys-is-undefined">Microsoft JScript runtime error: &#39;Sys&#39; is undefined</a></p>
  
  <p><a href="http://encosia.com/updated-your-webconfig-but-sys-is-still-undefined/" rel="nofollow noreferrer">http://encosia.com/updated-your-webconfig-but-sys-is-still-undefined/</a></p>
  
  <p><a href="http://www.codeproject.com/Questions/543002/Unableplustoplusgetpluspropertyplus-27PageRequestM" rel="nofollow noreferrer">http://www.codeproject.com/Questions/543002/Unableplustoplusgetpluspropertyplus-27PageRequestM</a></p>
  
  <p>Thanks
  Fahad Mullaji</p>