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You can change what part of the data of the field is selected when you move into a field by setting an option under Behavior Entering Field. Choose Select Entire Field (the default), to highlight all data in the field. Choose Go To Start Of Field to place the insertion point before the first character, and choose Go To End Of Field to place the insertion point after the last character. Under Arrow key behavior select Next field (the default) if you want to move from field to field when you press the Right Arrow or Left Arrow key. Choose Next character to change to the insertion point and move one character at a time when you press the Right Arrow or Left Arrow key. You can select Cursor stops at first/last field if you don t want pressing the arrow keys to move you off the current row. I personally prefer to set the Move after enter option to Don t move and the Arrow key behavior option to Next character. I use the Tab key to move from field to field, and I don t want to accidentally save the record when I press Enter. I leave the Behavior entering field option at the default setting of Select entire field so that the entire text is selected, but setting Arrow key behavior to Next character allows me to press the arrow keys to shift to single-character edit mode and move in the field.

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<category name=".NET"> <books> <book>CLR via C#</book> <book>Essential .NET</book> </books> </category>

When you have data in a table, you can easily change the data by editing it in Datasheet view. You must select data before you can change it, and you can do this in several ways.

In the cell containing the data you want to change, click just to the left of the first char-

acter you want to change (or to the right of the last character), and then drag the insertion point to highlight all the characters you want to change.

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Once we have the XElement in hand, we output the name of the category to the console with the help of the Attribute query axis method. Next we need to query the category XElement for all the book elements contained within it. Unfortunately, we need to select multiple elements, so we can t use the Element method that we ve already learned about. It looks like it s time to learn about the Elements axis method.

Double-click any word in a cell to select the entire word. Click at the left edge of a cell in the grid (that is, where the mouse pointer turns into a

large white cross). Access selects the entire contents of the cell. Any data you type replaces the old, selected data. In Figure 7-36, I have moved to the left edge of the First Name field, and Access has shown me the white cross mentioned in the last bullet. I can click to select the entire contents of the field. In Figure 7-37, I have changed the value to Mike, but haven t yet saved the row. (You can see the pencil icon indicating a change is pending.) Access also selects the entire entry if you tab to the cell in the datasheet grid (unless you have changed the keyboard options as noted earlier). If you want to change only part of the data (for example, to correct the spelling of a street name in an address field), you can shift to single-character mode by pressing F2 or by clicking the location at which you want to start your change. Use the Backspace key to erase characters to the left of the insertion point and use the Delete key to remove characters to the right of the insertion point. Hold down the Shift key and press the Right Arrow or Left Arrow key to select multiple characters to replace. You can press F2 again to select the entire cell. A useful keyboard shortcut for changing data is to press Ctrl+Alt+Spacebar to restore the data in the current field to the default value specified in the table definition. 260

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The Elements axis method is similar to the Element query axis method; the primary difference is that rather than returning the first matching XElement, Elements returns all matches. Given this, it shouldn t be surprising that Elements returns an IEnumerable of XElement objects, rather than a single XElement. Like Element, Elements accepts an XName as a parameter. In our case, we re looking for all <book> elements so we ll provide book as our parameter to Elements. Since the <book> elements aren t directly under the category XElement that we selected in sections 10.1.1 and 10.1.2, we ll need to select the <books> element with the Element query axis method, and then call Elements as shown in listing 10.4.

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The first part of the code makes sure the user has selected an employee name and entered a password. The data access page uses qryEmployeeSignon as its record source, so the code borrows that to find the employee and compare the password. If the password is incorrect, the code uses a hidden text box on the page to count the number of attempts and closes the window after the third failed attempt.

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XElement root = XElement.Load("categorizedBooks.xml"); XElement dotNetCategory = root.Element("category"); XAttribute name = dotNetCategory.Attribute("name"); XElement books = dotNetCategory.Element("books"); IEnumerable<XElement> bookElements = books.Elements("book"); Console.WriteLine((string) dotNetcategory); foreach(XElement bookElement in bookElements) { Console.WriteLine(" - " + (string)bookElement); }

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