You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.

You write the following code fragment.
<asp:ScriptManager ID=”ScriptManager1″ runat=”server” />
<asp:UpdatePanel ID=”updateLabels” runat=”server” UpdateMode=”Conditional”>
<ContentTemplate>
<asp:Label ID=”Label1″ runat=”server” />
<asp:Label ID=”Label2″ runat=”server” />
<asp:Button ID=”btnSubmit” runat=”server” Text=”Submit”
onclick=”btnSubmit_Click” />
</ContentTemplate>
</asp:UpdatePanel>
<asp:Label id=”Label3″ runat=”server” />

You need to ensure that when you click the btnSubmit Button control, each Label control value is asynchronously updatable.

Which code segment should you use?

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. 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 application by using the Microsoft .NET Framework version 3.5.

You create a login Web form by using the following code fragment.

<asp:ScriptManager ID=”ScriptManager1″ runat=”server” />
<asp:TextBox runat=”server” ID=”txtUser” Width=”200px” />
<asp:TextBox runat=”server” ID=”txtPassword” Width=”200px” />
<asp:Button runat=”server” ID=”btnLogin” Text=”Login” OnClientClick=”login(); return false;” />

When a user clicks the btnLogin Button control, the login() client-side script is called to authenticate the user. The credentials provided in the TextBox controls are used to call the client-side script.

You also add the following client-script code fragment in the Web form. (Line numbers are included for reference only.)

01 <script type=”text/javascript”>
02 function login() {
03 var username = $get(‘txtUser’).value;
04 var password = $get(‘txtPassword’).value;
05
06 // authentication logic.
07 }
08 function onLoginCompleted(validCredentials, userContext,
09 methodName)
10 {
11 // notify user on authentication result.
12 }
13
14 function onLoginFailed(error, userContext, methodName)
15 {
16 // notify user on authentication exception.
17 }
18 </script>

The ASP.NET application is configured to use Forms Authentication. The ASP.NET AJAX authentication service is activated in the Web.config file.

You need to ensure that the following workflow is maintained:

* On successful authentication, the onLoginCompleted client-script function is called to notify the user.
* On failure of authentication, the onLoginFailed client-script function is called to display an error message.

Which code segment should you insert at line 06?

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.

You create the following controls:

* A composite custom control named MyControl.
* A templated custom control named OrderFormData.

You write the following code segment to override the method named CreateChildControls() in the MyControl class. (Line numbers are included for reference only.)

01 protected override void
02 CreateChildControls() {
03 Controls.Clear();
04 OrderFormData oFData = new
05 OrderFormData(“OrderForm”);
06
07 }

You need to add the OrderFormData control to the MyControl control.

Which code segment should you insert at line 06?