Handling Ajax Asynchronous Post Back Error

I read this solution in one of the article, just want to share the same. 


1. We can handle ajax errors from client side by adding a custom handler to end_request event of PageRequestManager object. 
2. We can handle this by binding a error handler method to property OnAsyncPostBackError of Script manager object.


Client side handling:
<script type="text/javascript" language="javascript">
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

function EndRequestHandler(sender, args) {
  if (args.get_error() != undefined) {
    var errorMessage;
    if (args.get_response().get_statusCode() == '200') {
      errorMessage = args.get_error().message;
    }
    else {                
      // Error occurred somewhere other than the server page.
      errorMessage = 'An unspecified error occurred. ';                                }
    args.set_errorHandled(true);                
  }
}
</script>

Server side handling:

<asp:ScriptManager ID="ScriptManager1" runat="server" OnAsyncPostBackError="ScriptManager1_AsyncPostBackError"></asp:ScriptManager>

protected void ScriptManager1_AsyncPostBackError(object sender, AsyncPostBackErrorEventArgs e){
  if (e.Exception.Data["ExtraInfo"] != null){
    ScriptManager1.AsyncPostBackErrorMessage = e.Exception.Message + e.Exception.Data["ExtraInfo"].ToString();
  }
  else{
    ScriptManager1.AsyncPostBackErrorMessage = "An unspecified error occurred."
  }
}