You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a Web form by using ASP.NET AJAX. You write the following client-script code fragment to handle the exceptions thrown from asynchronous postbacks： 01 <script type="text/javascript"> 02 function pageLoad（） 03 { 04 var pageMgr = 05 Sys.WebForms.PageRequestManager.getInstance（）； 06 ► 07 } 08 09 function errorHandler（sender， args） 10 { 11 ► 12 } 13 </script> You need to ensure that the application performs the following tasks： use a common client-script function named errorHandler. udpdate a Label control that has an ID named lblError with the error message. prevent the browser from displaying any message box or Javascript error. What should you do？（）
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