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In the first line of listing 7.2, we create a new System.Data.Linq.XmlMappingSource instance in the lia.xml file in our application directory B. We can load this document using any of the following methods: FromXml, FromUrl, FromStream, or FromReader. To attach our XmlMappingSource object to the DataContext, we add it as the second parameter of the overloaded constructor C. Once we ve attached the external mapping to the DataContext, we re free to use all of the querying techniques we learned in chapter 6 D. As we ve mentioned, the XML mapping offers the benefit of centralizing the definitions and allows us to change the mappings dynamically as schema changes are made in the underlying database. The need to load and parse the XML file increases the overhead required to create the DataContext compared to using attributes. As with any programming task, test the various options in any situation to determine the most appropriate method. Each method has its positives and negatives.

Private Sub Detail_Format(Cancel As Integer, FormatCount As Integer) Don t print the return logo and address if this is a "spacer" record If IsNull(Me.ContactID) Then Me.imgLawTrack.Visible = False Me.lblRtnAddr.Visible = False Else Me.imgLawTrack.Visible = True Me.lblRtnAddr.Visible = True End If End Sub

The Format event of the Detail section depends on the fact that the ContactID in the spacer rows is Null. When printing a blank row for spacing, the code hides the logo and the return address label.

When you want to draw a border around a report print area, sometimes you ll need to write some code to ask Access to draw lines or a border after placing the data on the page. This is especially true if one or more controls on the report can grow to accommodate a large amount of data. 920

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Automating Your Application with Visual Basic I used the Report Wizard to create the basic rptContacts report using the Justified format. (I customized the report after the wizard finished.) The wizard created a fairly decent layout with a border around all the fields, but it didn t make the text box to display notes large enough to display the text for all contacts. Figure 23-29 shows you the report displaying my contact record from the database. You can see that the notes about me are cut off at the bottom.

One of the negatives that both the XML and attribute-based mappings face is the tedium caused by having to manually create and maintain the classes and mappings. Thankfully, Visual Studio includes a couple of options to help generate the mappings the command-line SqlMetal tool and the LINQ to SQL designer. If you re a masochist who enjoys manually creating your classes and mappings, you can skip the next sections. Otherwise, let s see how we can exploit the tools to do the monotonous work for us, starting with a command-line option SqlMetal.

Figure 23-29. A report using a border around the data, but one of the text boxes isn t large enough to display all the text.

It s simple enough to change the Can Grow property of the text box to Yes to allow it to expand, but the rectangle control used to draw the border around all the text doesn t also have a Can Grow property. The solution is to remove the rectangle and use the Line method of the report object in the report s Format event of the Detail section to get the job done. Below is the code you can find in this event procedure in the rptContactsExpandNotes report.

Private Sub Detail_Print(Cancel As Integer, PrintCount As Integer) Dim sngX1 As Single, sngY1 As Single Dim sngX2 As Single, sngY2 As Single, lngColor As Long Set coordinates sngX1 = 120 sngY1 = 120 sngX2 = 9120 Adjust the height if Notes has expanded sngY2 = 7680 + (Me.Notes.Height - 2565) Draw the big box around the data Set width of the line Me.DrawWidth = 8 Draw the rectangle around the expanded fields Me.Line Step(sngX1, sngY1)-Step(sngX2, sngY2), RGB(0, 0, 197), B End Sub

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Microsoft realized developers would be more likely to adopt the technology if tools were provided to automate the mapping process. One such tool is a command-line tool called SqlMetal. We point the tool at our database and it generates the corresponding business classes. The basic syntax for using the tool is SqlMetal [switches] [input file]. Let s see what happens if we try to generate classes for the SqlExpress database for this book. To begin, open the Visual Studio 2008 Command Prompt, located in the Visual Studio Tools folder for Visual Studio 2008. We need to use this command prompt rather than the standard command-line tool in order to set the necessary path settings. To generate our classes, enter the following from the command prompt, making sure to use the correct path to your database:

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