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Private Sub cmdPrint_Click() Dim strFilter As String, frm As Form Set an error trap On Error GoTo cmdPrint_Error Get a pointer to the Invoices form Set frm = Forms!frmInvoices Select Case Me.optFilterType.Value Current Invoice Case 1 Set filter to open Invoice report for current invoice only strFilter = "[InvoiceID] = " & frm!InvoiceID All unprinted invoices Case 2 Set filter to open all unprinted invoices strFilter = "[InvoicePrinted] = 0" Unprinted invoices for current company Case 3 Set filter to open unprinted invoices for current company strFilter = "[CompanyID] = " & frm!cmbCompanyID & _ " AND [InvoicePrinted] = 0" Displayed invoices (if filter set on form) Case 4

Set this value for the column of your table that uniquely identifies the row Most frequently, this is the primary key column of your table LINQ to SQL requires at least one column be indicated as the primary key for each class for use by the object identity and change tracking services; for multicolumn keys, set this in each Column attribute Use this attribute on columns that are the timestamp or version number of your record This value is updated each time the row is changed, and is useful for optimistic concurrency checks Indicates the name of the column in the table you wish to map to To map a column directly to the underlying private field in a class rather than using the public property setter, specify the name of the field as the storage parameter.

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Check for a filter on the form If IsNothing(frm.Filter) Then Make sure they want to print all! If vbNo = MsgBox("Your selection will print all " & _ "Invoices currently in the " & _ "database. Are you sure you want to do this ", _ vbQuestion + vbYesNo + vbDefaultButton2, _ gstrAppTitle) Then Exit Sub End If Set "do them all" filter strFilter = "1 = 1" Else strFilter = frm.Filter End If End Select Hide me Me.Visible = False Have a filter now. Open the report on that filter DoCmd.OpenReport "rptInvoices", acViewPreview, , strFilter Update the Print flag for selected invoices CurrentDb.Execute "UPDATE tblInvoices SET InvoicePrinted = -1 WHERE " & _ strFilter Refresh the form to show updated Printed status frm.Refresh Execute the Current event on the form to make sure it is locked correctly frm.Form_Current cmdPrint_Exit: Clear the form object Set frm = Nothing Done DoCmd.Close acForm, Me.Name Exit Sub cmdPrint_Error: Got an error If Cancel, that means the filter produced no Invoices If Err = errCancel Then Exit - report will display "no records" message Resume cmdPrint_Exit End If Got unknown error - display and log MsgBox "Unexpected error while printing and updating print flags: " & _ Err & ", " & _ Error, vbCritical, gstrAppTitle ErrorLog Me.Name & "_Print", Err, Error Resume cmdPrint_Exit End Sub

The NTFS architecture is structured to allow indexing of file attributes on a disk volume. This structure enables the file system to efficiently locate files that match certain criteria for example, all the files in a particular directory. The FAT file system indexes file names but doesn t sort them, making lookups in large directories slow. Several NTFS features take advantage of general indexing, including consolidated security descriptors, in which the security descriptors of a volume s files and directories are stored in a single internal stream, have duplicates removed, and are indexed using an internal security identifier that NTFS defines. The use of indexing by these features is described in the section NTFS On-Disk Structure later in this chapter.

The first part of this procedure sets an object reference to the frmInvoices form to make it easy to grab either the InvoiceID or the CompanyID and to reference properties and methods of the form s object. The Select Case statement examines which option button the user selected on fdlgInvoicePrintOption and builds the appropriate filter for the report. Notice that if the user asks to print all the invoices currently displayed on the form, the code first looks for a user-applied filter on the frmInvoices form. If the code finds no filter, it asks if the 905

When you want to change the definition of a report, you must open the report in Design view. In the report list for Housing Reservations, hold down the Ctrl key and double-click the rptEmployeesPlain report to see the design for the report, as shown in Figure 2-17. Don t worry if what you see on your screen doesn t exactly match Figure 2-17. In this figure, I moved a few things and selected several options so that you can see all the main features of the Report window in Design view.

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