Configuring a Data Source in Visual Studio .NET

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7 BINDING THE USER INTERFACE TO THE BUSINESS OBJECTS
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NOTE: The Add New Data Source link only appears when the Data Sources window is empty
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This launches the Data Source Con guration Wizard The rst page, shown in Figure 71, allows you to select the source of the data
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The Data Source Con guration Wizard helps you de ne data sources for your
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5 Select Object for object binding, and click Next The second page of the Data Source Con guration Wizard, shown in Figure 72, provides the list of classes for your selection
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Figure 72 Only the classes that are in the current project or referenced by the current project are displayed
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Binding the UI to the Business Objects
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6 Use the tree view to navigate to the class you wish to use for object binding The tree view only lists the classes in the Windows Application project and classes in any component referenced by the Windows Application project If you already have a reference to your business object Class Library component, the component appears in the Data Source Con guration Wizard, as shown later in Figure 74, and you can skip to step 9 Otherwise, you can add a reference using the following steps 7 Click the Add Reference button The Add Reference dialog appears, as shown in Figure 73
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Figure 73 Select the Projects tab in the Add Reference dialog to display all the other projects in the current solution 8 In the Add Reference dialog, select the component containing the class for the data source, and click OK The classes in the referenced project are then added to the Data Source Con guration Wizard, as shown in Figure 74 9 Select the desired class, and click Finish The object data source for the selected class is added to the Data Sources window, as shown in Figure 75
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NOTE: The Data Sources window lists only class properties that are defined with a Property statement
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Configuring a Data Source
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Select the desired business object class for the data source Notice that the documentation that you de ned for your class is provided below the tree view in this dialog
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Figure 75 The Data Sources window lists each data source available for binding For object data sources, it lists the class name along with all its public properties Use the Data Source Con guration Wizard to de ne a data source for every business object class you plan to use for binding If you are curious about where the Data Sources window stores its information, it is in a set of XML les Select the Windows Application project in Solution Explorer, and click the Show All Files button on the Solution Explorer toolbar All the system les for the project are then accessible from Solution Explorer Open the My Project node under the Windows Application project, and open the DataSources node under the My Project node to see the XML les for the data sources in the Data Sources window Creating data sources is quick and easy Add a data source to the Windows Application project for any business object class that you want to use for binding to your user interface
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For the Purchase Tracker sample application: Build the business object Class Library project (PTBO) Performing a build ensures that all the business object classes are available to the Data Sources window Select the Windows Application project (PTWin) in Solution Explorer Create an object data source for the Product class Create an object data source for the Customer class Both data sources appear in the Data Sources window, along with all their public properties
Adding Properties to a Data Source
The only absolute in software development is that things change Over time, you may need to add or remove business object properties The Data Sources window is smart about code changes It automatically re ects any changes you make to your business object classes For example, the ProductWin form shown in Figure 76 has several elements that are not in the Data Sources window for the Product class The Product class is missing product number, description, price, product type, and carried in stock/special order The rst three of these are basic properties that are added as described in this section The last two are special cases that are discussed later in this chapter
Figure 76 To bind a control on a form to a business object property, the business object class must have the associated property Add properties to your business object class as needed