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. （Line numbers are included for reference only.） 
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 } 
| English | Chinese | Japan | Korean | - 146 - Test Information Co.， Ltd. All rights reserved. 13 </script> 
You need to ensure that the application performs the following tasks： &iexcl；¤Use a common clien-script function named errorHandler. &iexcl；¤Update a Label control that has an ID named lblEror with the error message. &iexcl；¤Prevent the browser from displaying any message box or Javascript error 
What should you do？ （）

You create a Microsoft ASP.NET application by using the...

单项选择题

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. 
You write the following code segment to create a client-script function. （Line numbers are included for reference only.） 
01 function updateLabelControl（labelId， newText） { 
02 var label = $find（labelId）； 
03 label.innerHTML = newText； 
04 } 
The client script function uses ASP.NET AJAX and updates the text of any Label control in the Web form. 
When you test the client script function， you discover that the Label controls are not updated. Youreceive 
| English | Chinese | Japan | Korean | - 145 - Test Information Co.， Ltd. All rights reserved. the following JavaScript error message in the browser： "’null’ is null or not an object." You need to resolve the error. 
What should you do？（）

You create a Microsoft ASP.NET application by using the...

单项选择题

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. 
You write the following code segment to create a client-script function. （Line numbers are included for 
| English | Chinese | Japan | Korean | - 144 - Test Information Co.， Ltd. All rights reserved. reference only.） 
01 function updateLabelControl（labelId， newText） { 
02 var label = $find（labelId）； 
03 label.innerHTML = newText；
04 } 
The client script function uses ASP.NET AJAX and updates the text of any Label control in the Web form. 
When you test the client script function， you discover that the Label controls are not updated. You receive the following JavaScript error message in the browser： "’null’ is null or not an object." You need to resolve the error. 
What should you do？（）

You create a Microsoft ASP.NET Web application by using...

单项选择题

You create a Microsoft ASP.NET Web application by using the Microsoft .NET Framework version 3.5. 
You add the following code fragment to an AJAX-enabled Web form. （Line numbers are included for reference only.） 
01 <asp：ScriptManager ID="scrMgr" runat="server" /> 
02 <asp：UpdatePanel ID="updPanel" runat="server" 
03 UpdateMode="Conditional"> 
04 <ContentTemplate> 
05 <asp：Label ID="lblTime" runat="server" /> 
06 <asp：UpdatePanel ID="updInnerPanel" 
07 runat="server" UpdateMode="Conditional"> 
08 <ContentTemplate> 
| English | Chinese | Japan | Korean | - 143 - Test Information Co.， Ltd. All rights reserved. 09 <asp：Timer ID="tmrTimer" runat="server" 
10 Interval="1000" 
11 OnTick="tmrTimer_Tick" /> 
12 </ContentTemplate> 
13 
14 </asp：UpdatePanel> 
15 </ContentTemplate> 
16 
17 </asp：UpdatePanel> 
The tmrTimer_Tick event handler sets the Text property of the lblTime Label control to the current time of the server. 
You need to configure the appropriate UpdatePanel control to ensure that the lblTime Label Control is properly updated by the tmrTimer Timer control.
What should you do？（）