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If you scroll down to the Event properties, you ll find an event procedure defined for On Dbl Click. The code for this event procedure (which is called when you double-click an item in the list box) runs only the cmdSome_Click procedure. Right-click the cmdSome command button (the one whose caption says Edit), and choose Build Event from the shortcut menu to jump to the cmdSome_Click procedure that does all the work, as shown below.

foreach (Book b in ExpensiveBooks) { b.Price -= 5; } dataContext.SubmitChanges();

Private Sub cmdSome_Click() Dim strWhere As String, varItem As Variant Request to edit items selected in the list box If no items selected, then nothing to do If Me!lstCName.ItemsSelected.Count = 0 Then Exit Sub Loop through the items selected collection For Each varItem In Me!lstCName.ItemsSelected Grab the ContactID column for each selected item strWhere = strWhere & Me!lstCName.Column(0, varItem) & "," Next varItem Throw away the extra comma on the "IN" string strWhere = Left$(strWhere, Len(strWhere) - 1) Open the contacts form filtered on the selected contacts strWhere = "[ContactID] IN (" & strWhere & ") And (Inactive = False)" DoCmd.OpenForm FormName:="frmContacts", WhereCondition:=strWhere DoCmd.Close acForm, Me.Name End Sub

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The Windows boot process doesn t begin when you power on your computer or press the reset button. It begins when you install Windows on your computer. At some point during the execution of the Windows Setup program, the system s primary hard disk is prepared with code that takes part in the boot process. Before we get into what this code does, let s look at how and where Windows places the code on a disk. Since the early days of MS-DOS, a standard has existed on x86 systems for the way physical hard disks are divided into volumes. Microsoft operating systems split hard disks into discrete areas known as partitions and use file systems (such as FAT and NTFS) to format each partition into a volume. A hard disk can contain up to four primary partitions. Because this apportioning scheme would limit a disk to four volumes, a special partition type, called an extended partition, further allocates up to four additional partitions within each extended partition. Extended partitions can contain extended

When you set the MultiSelect property of a list box to something other than None, you can examine the control s ItemsSelected collection to determine what (if anything) is selected. In the cmdSome_Click procedure, the Visual Basic code first checks the Count property of the control s ItemsSelected collection to determine whether anything is selected. If the Count is 0, there s nothing to do, so the procedure exits.

Automating Your Application with Visual Basic The ItemsSelected collection is composed of variant values, each of which provides an index to a highlighted item in the list box. The For Each loop asks Visual Basic to loop through all the available variant values in the collection, one at a time. Within the loop, the code uses the value of the variant to retrieve the Contact ID from the list. List boxes also have a Column property, and you can reference all the values in the list by using a statement such as

Me.ListBoxName.Column(ColumnNum, RowNum)

The code in listing 6.28 is straightforward C# code. We start by fetching the records that we want to modify B. We then make the necessary changes by working with the book object just as we would with any other collection C. Once we re done, we call SubmitChanges to commit the changes D. We don t need to worry about creating a separate mapping to issue an update command. The context takes the same metadata we created for querying and uses it to generate the necessary update statement. Here is the SQL that was generated for our example:

where ListBoxName is the name of your list box control, ColumnNum is the relative column number (the first column is 0, the second is 1, and so on), and RowNum is the relative row number (also starting at 0). The variant values in the ItemsSelected collection return the relative row number. This Visual Basic code uses column 0 and the values in the ItemsSelected collection to append each selected ContactID to a string variable, separated by commas. You ll recall from studying the IN predicate in 7, Creating and Working with Simple Queries, that a list of values separated by commas is ideal for an IN clause. After retrieving all the ContactID numbers, the next statement removes the trailing comma from the string. The final Where clause includes an additional criterion to display only active contacts. The DoCmd.OpenForm command uses the resulting string to create a filter clause as it opens the form. Finally, the code closes the frmContactList form. (Me.Name is the name of the current form.)

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