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Occurs when the data access page has finished loading. Your code cannot cancel this event. Occurs when the user has changed a bound control on the data access page. Your code can set the ReturnValue property of the dscEventInfo object to False to cancel the change. Occurs when a new section of the data access page has received the focus. Your code cannot cancel this event. Occurs when the user has navigated to a new set of records, has navigated to another Web page, or has closed the Web page. Your code can set the ReturnValue property of the dscEventInfo object to False to attempt to cancel the navigation. Caution: Your code cannot cancel RecordExit when the user navigates to a different Web page or closes the browser window. You can create an OnBeforeUnload event procedure for the DHTML page to warn the user to not perform these actions. Occurs continually during the execution of an ExportXML method. Your code can examine the PercentComplete property of the dscEventInfo object to determine the progress. Your code can set the ReturnValue property of the dscEventInfo object to False to cancel the export. Occurs when the user clicks the Undo button on a navigation bar or presses the Esc key to undo a change. This event also occurs when your code cancels the Dirty event. Your code can set the ReturnValue property of the dscEventInfo object to False to cancel the undo.

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We ll remind you of this as we move through our discussion of each method, but since it s important to understand, we wanted to call your attention to it now before getting started With that out of the way, let s get started with the LINQ to XML axis methods To explore what the LINQ to XML axis methods provide, let s try to produce the following output with the help of the axis methods:.

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To produce this output, we ll need to learn a bit about the Element, Attribute, and Elements axis methods. Once we have a good grasp on these three core axis methods, we ll move on to look at a few other axis methods such as Descendants and Ancestors. Let s get started by showing how the Element axis method can be put into action and get us on our way to accomplishing our goal.

Table 27-4.

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The DataPage object for the section that triggered the event. Your code can use the Recordset property of this object to examine the recordset open in the section. Your code can use the Fields collection of the Recordset object to examine and update the fields in the current record. In the BeforeDelete event, indicates whether the standard delete confirmation message is displayed. Your code can set this property to DscDataAlertContinue to cancel the message display or DscDataAlertDisplay to allow the message to be displayed. In the DataError event, returns an ADO error object that your code can examine to determine the cause of the error. In the RecordSaveProgress event, returns a long integer value indicating the progress. A value of 100 indicates the process is complete. In events that can be cancelled, your code can set this property to False to cancel the event. Returns a Section object indicating the section that triggered the event. In the AfterDelete event, returns a value indicating the status of the delete. The value dscDeleteOK indicates that the delete completed successfully. The value dscDeleteCancel indicates that your code cancelled the delete. The value dscDeleteUserCancel indicates that the user cancelled the delete in response to the standard system prompt.

All event procedure code must appear between <SCRIPT> and </SCRIPT> tags. Inside the <SCRIPT> tag, you must always indicate the language that you used for the script code. You can also optionally define the event and the object that you expect to signal the event, and when you do that, you do not need Sub and End Sub statements. For example, you can write a BeforeDelete event for the MSODSC object as

The first thing that we need to do to produce our desired output is select the .NET category element within our XML. The Element axis method allows us to select a single XML element by name. In our case, we re looking to select the first XML element with the category name. We can use listing 10.2 to do just that.

<SCRIPT language=vbscript> Sub MSODSC_BeforeDelete(dscEventInfo) MsgBox "Before delete event fired." dscEventInfo.DisplayAlert = DscDataAlertContinue End Sub </SCRIPT>

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