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Now that we ve seen how to add XML document type declarations to our XML documents, let s finish off our discussion of the classes that we ll use when creating XML documents by looking at how we can include XML comments. XComment Like the comments that we place within our C# and VB.NET code, XML comments can be added to XML documents to provide an explanation of what is contained within the document. An XML comment can be constructed with a string or by reading the XML comment that an XmlReader is currently positioned on. The XComment class is not limited to use within XDocument classes, but we don t see it as important so we ve buried it down here where nobody except you will ever see it. After all, XML is supposed to be human readable, why should we need comments Now that we ve covered how to use LINQ to XML to create XML from scratch using XElement and XDocument, it s time to look at how we can update and modify the XML we ve created.

Note The ClassName property for each control defines how the control operates, and you can change this property to change the look and functionality of a control. You can set the ClassName property to one of a special set of navigation classes to convert the control to a navigation button that controls the records displayed. For example, setting the ClassName property to MsoNavNext changes the control to respond to a click and move the data display to the next record. As you might guess, the other navigation class names are MsoNavFirst, MsoNavPrevious, and MsoNavLast.

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To move an element, click on it and drag it to a new location. You can also hold down the Shift key and click several elements or encircle several controls with your mouse pointer to select multiple elements together and drag them to a new location. To resize an element, first select it, and then drag an edge or stretch a corner. You can select multiple elements and then resize them together. To delete an element, first select it, and then press the Delete key. To add an element, first select it in the toolbox and then, in the data access page window, click the spot where you want that element to appear. As with the toolbox in form and report design, you can double-click a tool to lock the selection so that you can add several elements of the same type without having to go back to the toolbox. You can align and size multiple elements similarly to the process you use for controls in forms and reports but with a significant difference. When you select multiple elements, the last element you select becomes the controlling element. So, when you select multiple elements and then choose Align from the Format menu and then Left from the submenu, the elements line up with the left edge of the last element you selected, not to the leftmost edge of all the selected elements. Figure 27-18 shows you a data access page with multiple elements selected. You can identify the controlling element when you select multiple elements because the sizing boxes around it appear white. The sizing boxes around other elements appear black.

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looking at how we can insert new elements and attributes into an existing XElement. After loading or constructing an XElement, you may want to add additional child items to the element. The Add method allows content to be added to an existing XElement. The definition of the Add method is similar in nature to the constructors offered by XElement. It provides two overloads. The first overload takes in a single object, while the second allows a variable number of items to be added as content. The following are the two overloads for Add:

Figure 27-18. When you select multiple elements on a data access page, the sizing boxes around the controlling element appear white.

You should refer to this description for a complete picture of the standard transactional recovery mechanisms..

In addition to aligning left, right, top, or bottom, you can also choose Align Middle or Align Center. For example, if you select multiple elements that are arranged horizontally across the page (such as a row of text boxes) and choose Align Middle, all the elements will shift up or down so that they center vertically on the controlling element. Applying Align Center to 1037

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