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For the Purchase Tracker sample application: Add a form project item to the Windows Application project (PTWin) using the Inherited Form template, and inherit from your base form class (PTBaseWin) Name the form CustomerWin In the Data Sources window, select the Customer node and use the drop-down control list to select Details as the type of control to render NOTE: If your Data Sources window appears empty, ensure that the Windows Application project (PTWin) is the active project in Solution Explorer In the Data Sources window, select the CustomerPurchases property and use the drop-down control list to select None as the type of control to render The CustomerPurchases property is not rendered on the CustomerWin form
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In the Data Sources window, select the CustomerID property and use the drop-down control list to select None as the type of control to render Normally, you don t show IDs to the user Alternatively, you could set the BrowsableAttribute for the CustomerID property in the Customer class and rebuild the business object Class Library project to hide the CustomerID property from the Data Sources window If you want to use the same conceptual user interface style for your CustomerWin form as with the ProductWin form, add two Panel controls to the CustomerWin form and set their Dock properties as you did with the ProductWin form in 4 Drag the Customer node from the Data Sources window to the CustomerWin form to create the controls on the form The CustomerWin form appears similar to Figure 79 If you added Panel controls, drop the Customer node in the bottom panel to add the controls to that panel Remove the BindingNavigator component from the form Update the arrangement, caption, and tab order of the controls so that the form appears similar to Figure 710 If you added Panel controls, the bottom panel appears similar to Figure 710, and the top panel is empty at this point 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 Open the MDI parent form (PTMDIParentWin) in the Code Editor In the MDI parent form (PTMDIParentWin), create the Click event handler for the Manage Customers option on the Customers menu, and add code to display the CustomerWin form, as described in 4 Run the application It displays your splash screen and then shows the MDI parent form Select Customers | Manage Customers to display the CustomerWin form If you built the form using binding as defined, and you had set initial values for each property in the Create method for the Customer class, the form is populated similar to Figure 710 Notice that as you tab through the form, the background color of each control changes This demonstrates the benefit of inheritance By simply inheriting from the base form class, you have the code to handle the Enter and Leave events on this form
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Some controls require special handling for them to bind correctly Radio buttons are an example, because they basically require that one property map to multiple controls, which is not possible So to bind to radio buttons, you need a property for the set of radio buttons and a property for each radio button Normally, there is only one stored value for a set of radio buttons This value is managed using the business object property de ned for the set of radio buttons For example, the set of stock type radio buttons, shown in Figure 78, is stored as a stock type value of S for Carried in Stock and O for Special Order This value is managed with a StockType property However, the radio buttons don t understand the StockType values Radio buttons can only be on (true) or off (false) So the business object must also have Boolean properties for each radio button This example has two radio buttons so needs two Boolean properties: CarryInStock and OrderOnly Code in the StockType property maps the stock type values to the appropriate Boolean property values using code similar to the following:
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Public Property StockType() As String Get Dim returnValue As String = StringEmpty If CarryInStock = True Then returnValue = "S" ElseIf OrderOnly = True Then returnValue = "O" End If Return returnValue End Get Set(ByVal value As String) ' Also assign the appropriate Boolean Select Case value Case "S" CarryInStock = True Case "O" OrderOnly = True End Select End Set End Property
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