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Next, you need to divide by 7 to calculate the number of weeks. You re not interested in any fractional part of a week, so you need to use the integer divide operator (\). Note there is no operator button for integer divide. The operator buttons are arranged horizontally between the upper and lower panes. So, you can either type in the operator or scroll down in the leftmost pane, click Operators to open that list, select Arithmetic in the second pane to filter the rightmost list, and double-click the integer divide operator (\) in the rightmost list to add it to your expression. Make sure the insertion point in the top pane is positioned after the integer divide operator and type the number 7. The next operation you need is to multiply the expression you have thus far by the WeeklyRate field from tblReservations. If you like, you can add left and right parentheses around the expression before adding the multiply operator and the field. Remember from Table 7-4 that multiplication and division are of equal precedence, so Access evaluates the division before the multiplication (left to right) even if you don t add the parentheses. But, as I noted earlier, I like to make the precedence of operations crystal clear, so I recommend you add the parentheses. Press the Home key to go to the beginning of the expression, click the left parenthesis button, press the End key to go to the end, click the right parenthesis button, click the multiply operator (*) button, and finally select the WeeklyRate field from the tblReservations field list.

Figure 23-12.

If we were limited to fetching data, the functionality would be no more than a reporting tool. Luckily, updating the data is just as simple as fetching it. As long as we have a persistent DataContext object, we can make additions, alterations, and deletions using standard methods on the table objects. The DataContext keeps track of the changes and handles updating the database with a single method call. To begin, let s look at an example that updates the price of our most expensive books so we can offer a discount on them (see listing 6.28). In this case, we fetch

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Automating Your Application with Visual Basic In this list box, the contacts are shown in alphabetic order by last name, and the list is bound to the ContactID field in the underlying table. You can edit any single contact by simply double-clicking the person s name. You can move the highlight up or down by using the arrow keys. You can also type the first letter of a contact last name to jump to the next contact whose last name begins with that letter. You can hold down the Shift key and use the arrow keys to extend the selection to multiple names. Finally, you can hold down either the Shift key or the Ctrl key and use the mouse to select multiple names. Figure 23-12 shows three contacts selected using the Ctrl key and the mouse. When you click the Edit button, the application opens the frmContacts form with only the records you selected. As shown in Figure 23-13, the caption to the right of the Record Number box indicates three available records and that the recordset is filtered.

Figure 23-13.

To see how this works, you need to go behind the scenes of the frmContactList form. Click Exit on the main switchboard form to return to the Database window. (Click Yes in the Are you sure you want to exit dialog box, and click No if the application offers to create a backup for you.) Select frmContactList, and open the form in Design view, as shown in Figure 23-14. Click the list box control, and open its property sheet to see how the list box is defined. The list box uses two columns from the qlkpContacts query, hiding the ContactID (the primary key that will provide a fast lookup) in the first column and displaying the contact name in the second column. The key to this list box is that its MultiSelect property is set to Extended. Using the Extended setting gives you the full Ctrl+click or Shift+click features that you see in most list boxes in Windows. The default for this property is None, which lets you select only one value at a time. You can set it to Simple if you want to select or clear multiple values using the mouse or the Spacebar.

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only the books that are expensive where the price is greater than $30 and then iterate over them, reducing the price of each by $5. Finally, we persist the changes to our database by calling the SubmitChanges method on our DataContext object.

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DataContext dataContext = new DataContext(liaConnectionString); var ExpensiveBooks = from b in dataContext.GetTable<Book>() where b.Price>30 select b;

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