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As you can see, the way we work with attributes within LINQ to XML closely parallels how we work with elements. The key difference is that XAttribute objects are not nodes in the element tree, but are name-value pairs associated with an XML element. We ve gotten to a point where we can create XML from scratch using functional construction as well as manipulate that XML in all ways possible. As we continue, we ll likely want to figure out how our modified XML can be saved. Lucky for us, that s the focus of our next section.

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Because the kernel wants to avoid modifying the disk until Chkdsk executes, late in the boot process, IopBootLog can t simply dump messages into a log file Instead, IopBootLog records messages in the HKLM\SYSTEM\CurrentControlSet\BootLog registry value As the first user-mode component to load during a boot, the Session Manager (\Windows\System32\Smssexe) executes Chkdsk to ensure the system drives consistency and then completes registry initialization by executing the NtInitializeRegistry system call The kernel takes this action as a cue that it can safely open a log file on the disk, which it does, invoking the function IopCopyBootLogRegistryToFile This function creates the file Ntbtlogtxt in the Windows system directory (\Windows by default) and copies the contents of the BootLog registry value to the file.

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Microsoft Office Access 2003 Inside Out To start this exercise, go to the Database window, select Tables on the Object bar, select the tblFacilities table, and choose Page from the Insert menu. Access displays the New Data Access Page dialog box as shown in Figure 27-36.

The process of saving XML is extremely straightforward. The XElement and XDocument classes provide a Save method that will save your XML to a file, an XmlTextWriter, or an XmlWriter. To save an XElement to disk, we can call Save and pass a file path as a parameter, as in listing 9.29.

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Make sure you select the Design View option and click OK. Access starts a new data access page with the field list open to the data source you chose, as shown in Figure 27-37.

You can select the data source control, set its RecordSource property, add text boxes one at a time, and set the ControlSource property for each, but that s a lot of unnecessary work. The simplest way to add bound controls is to select the fields you want in the field list and drag 1056

Building Data Access Pages and drop them onto the data source control When you do this, Access automatically sets the RecordSource property for you Start by holding down the Ctrl key and selecting the FacilityID, FacilityName, FacilityAddress, FacilityCity, and FacilityStateOrProvince fields in the tblFacilities table Drag and drop those fields onto the data source control about 025 inches down from the top (As you ll see later, you re leaving this space at the top to add related fields from the tblFacilityRooms table) Don t drag and drop the FacilityPostalCode field the field has a lookup defined on the tlkpZips table, but that table supplies more than 50,000 rows The default limit for a data access page is 10,000 rows, so the combo box that Access would create when you drag and drop the FacilityPostalCode field won t show all the available records from tlkpZips.

XElement books = new XElement("books", new XElement("book", new XElement("title", "LINQ in Action"), new XElement("author", "Steve Eichert"), new XElement("author", "Jim Wooley"), new XElement("author", "Fabrice Marguerie") ) ); books.Save(@"c:\books.XML");

You could change the default data limit, but your data access page will be very slow to open You can use this lookup on a form because Access optimizes fetching rows and doesn t actually load the records until you drop down the combo box list A data access page, however, always loads the entire row source when you open the page This not only might be very slow over a Web network, but it also might cause your Web browser to run out of memory as it attempts to load all 50,000 rows To add the FacilityPostalCode field, click away from the group of controls you just added to cancel the selection, select the Text Box tool in the toolbox, and add one text box to your page On the Data tab of the Properties window, set the ControlSource property of this new text box to the FacilityPostalCode field.

Select the attached label, and on the Other tab in the Properties window, enter ZIP Code: in the InnerText property You might need to resize the label to display the entire caption Your data access page should now look like Figure 27-38..

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