Dim myProduct = New Product MeProductBindingSourceDataSource = myProduct in .NET

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Dim myProduct = New Product MeProductBindingSourceDataSource = myProduct
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This example binds the controls in the user interface to a new instance of the Product class If you used the Factory method pattern to create your business objects as described in 5, you need to write only one line of code:
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MeProductBindingSourceDataSource = ProductCreate(1)
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This code binds the controls in the user interface to the product with a product ID of 1
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Binding to Existing Controls
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In either case, you place this binding code in the form The speci c location in the form depends on when you want the binding to occur If you want the binding to occur when the form is loaded, add this code to the form s Load event For example, assume that the preceding line of code is added to a form s Load event When the form is loaded, the runtime calls the Create method of the Product class to create an instance of the class for a product with an ID of 1 By setting that instance as the DataSource for the ProductBindingSource, the runtime uses the properties associated with that instance to populate any controls on the form bound to the ProductBindingSource So by writing only one line of code, when you run your application, your form appears populated with appropriate data If the user changes a value in a control on the form, the runtime assigns the revised value to the associated property
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NOTE: The business object property is assigned to the value from the control when the user leaves the control By default, if the user modifies a value and then closes the form before leaving the control, the bound property is not changed However, if you add code to call MeValidate, as described in 8, the current control s value is assigned to its associated property even if the user does not leave the control
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7 BINDING THE USER INTERFACE TO THE BUSINESS OBJECTS
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Building Along
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For the Purchase Tracker sample application: Open the ProductWin form in the Forms Designer Open the Data Sources window Bind the Product Name, Product Number, Description, and Price TextBox controls to their associated Product class properties by dragging the appropriate property from the Data Sources window and dropping it on the control Remove any current code in the form s Load event Any code inserted into this event in prior Building Along activities is no longer needed with object binding Add the one line of code to the form s Load event that assigns the DataSource property of the BindingSource to the instance of the business object returned from the Create method as shown in this section
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7
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Binding the UI to the Business Objects
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Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form If you bound each of the controls as defined and you had set initial values for each property in the Create method for the Product class, the form is populated and looks similar to Figure 78 You can change the value in any of the controls However, this chapter does not provide the code to actually save the property values, so each time you run the application, the properties are returned to the hard-coded values you set in the Create method (Data is retrieved from a database and saved back to the database in 8)
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When you add one line of code, your form now displays the values of the bound properties
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Using object binding to bind data to a form is easy (and actually fun) to do Just set up your data source, drag and drop from the data source to the controls, and add one line of code
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Binding to New Controls
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Now for the really fun part In addition to binding to existing controls, as described in the preceding section, you can use the features of the Data Sources window to add new controls to a form Or you can use it to automatically create controls for all of the business object properties
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