BINDING THE USER INTERFACE TO THE BUSINESS OBJECTS in VS .NET

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When code in the application gets the StockType property, the code checks the Boolean properties It returns an S if the CarryInStock property is True or O if the OrderOnly property is True When code sets this property, the property sets the appropriate Boolean property to True To bind to a radio button: 1 Add a property to the business object class for each radio button You can create these properties quickly using a code snippet, as shown in 6 Be sure to include all the code required to call DataStateChanged, as demonstrated in 5 For example, for a set of stock type radio buttons, add properties to the Product class for CarryInStock, OrderOnly, and any other desired stock type 2 Add code to the Property statement for each property to reset the related properties when this property is set Radio buttons work in a set so that when one radio button is turned on, the others are turned off The same is true of the associated properties When one is set on, the others need to be set off For example:
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If CarryInStock = True Then OrderOnly = False ' Set every other stock type to False here End If
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3 Add a property in the business object class for the set of radio buttons, and add code similar to that shown in this section You can create a property quickly using a code snippet, as shown in 6 This property does not need to call the DataStateChanged method For example, a StockType property in the Product class handles the set of stock type radio buttons 4 Build the business object Class Library project This ensures that all changes made to the business object class appear in the Data Sources window 5 If the radio buttons are already on the form, bind each radio button to its associated property by dragging the property from the Data Sources window and dropping it on the RadioButton control 6 If the radio buttons are not already on the form, select each associated property in the Data Sources window and use the drop-down control list to select RadioButton as the type of control to render
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Then drag each property from the Data Sources window and drop it on the form By default, a Boolean property renders as a CheckBox control To instead render as a RadioButton control, drop down the control list for each Boolean property, and select RadioButton from the list This example demonstrates the use of two radio buttons in a set Use the same steps to de ne any number of radio buttons in a set De ne a property for each of the radio buttons Add code to the property for each radio button to turn off all the other radio buttons Add code to the property for the set of radio buttons to turn on the appropriate radio button based on the property value Binding to radio buttons is a bit more work, but it s possible using the techniques described in this section
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For the Purchase Tracker sample application: Open the Product class in the Code Editor Add CarryInStock, OrderOnly, and StockType properties Add code in the Property statement for the CarryInStock and OrderOnly properties to turn off the other property when the property is set For example, the code for CarryInStock is as follows:
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Public Property CarryInStock() As Boolean Get Return _CarryInStock End Get Set(ByVal value As Boolean) If _CarryInStock <> value Then Dim propertyName As String = "CarryInStock" MeDataStateChanged(EntityStateEnumModified) _CarryInStock = value ' If this is true, ' set the other choice(s) to false If CarryInStock = True Then OrderOnly = False End If
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7 BINDING THE USER INTERFACE TO THE BUSINESS OBJECTS
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End If End Set End Property
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The code for OrderOnly is similar Add code in the Property statement for the StockType property to set the other two properties based on the property value using the code shown in this section Add code to the Create method in the Product class to define a hard-coded value for the StockType property There are only two valid values, O or S Set it to O Build the business object Class Library project (PTBO) Bind the CarryInStock and OrderOnly properties to the appropriate RadioButton controls already on the ProductWin form Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form The Special Order radio button value is set If you click the Carried in Stock radio button, the Special Order radio button is turned off
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