Public Property ProductName() As String in .NET framework

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Public Property ProductName() As String
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Use good naming conventions for your property name The recommended convention is to use the property s human-readable name, concatenating the words and using Pascal case, whereby each word in the name is capitalized 4 Press the Enter key to automatically generate the remaining structure of the Property statement:
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Public Property ProductName() As String Get End Get Set(ByVal value As String) End Set End Property
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5 Add code within the Get and Set blocks
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Defining Properties
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The minimum code in the getter returns the value of the private variable:
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Get Return _ProductName End Get
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NOTE FOR VB6 DEVELOPERS: Use the Return statement instead of using the property s name to return a value
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Add any other code to the getter, such as formatting or data conversions For example, for a product number, the getter could add hyphens or other characters used by the human reader that are not necessarily stored with the actual data The minimum code in the setter sets the value of the private variable:
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Set(ByVal value As String) _ProductName = value End Set
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5 BUILDING THE BUSINESS LOGIC LAYER
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Add any other code to the setter, such as validation or data conversion For example, code could validate that the product name is not empty before it is assigned to its private variable
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NOTE FOR VB6 DEVELOPERS: The Property statement is similar to the VB6 property procedures However, there is no separate Let and Set The Set statement is no longer needed to assign object variables Object variables can now be assigned with a simple equals sign, as with any other variable (remember from 1 that everything in NET is basically an object)
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Repeat these steps to de ne each property of your class Alternatively, you can use code snippets or the Class Designer, as described in the next chapter, to assist you in de ning the properties of your class Use properties to de ne the data managed by your business object Use Property statements to provide access to the properties from other parts of the application
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Building the Business Logic Layer
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For the Purchase Tracker sample application: Open the Product class in the Code Editor Add the ProductName property, as defined in this section Open the ProductWin form in the Code Editor In the Load event for the ProductWin form, add code to set and then display the ProductName property:
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Dim prod as Product prod = New Product prodProductName = "shoes" DebugWriteLine(prodProductName) ' Displays shoes
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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 The debug message appears in the Immediate window (Debug | Windows | Immediate) or in the Output window (Debug | Windows | Output), depending on your settings
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Property Statements Versus Public Variables
The example in the preceding section seemed like much more code than simply adding a public variable Why bother with Property statements Using a private variable and public Property statements has several advantages over just using public variables:
You can add code that is executed before a property is assigned This code can perform validation, such as to ensure that no invalid values are assigned to the property You can add code that is executed before a property is retrieved This code can format or convert the value For example, it could add dashes to the product number for the human reader even though the dashes are not stored with the data Without a Property statement, any code that references the class can manipulate or destroy the property value at will Some of the Visual Studio tools, such as object binding, recognize only properties de ned with Property statements (See 7, Binding the User Interface to the Business Objects, for more information on object binding)
Defining Properties
For these reasons, always use private variables and public Property statements to de ne the properties for your classes
Documenting the Property
It is always a good idea to add documentation for a property immediately after de ning the property By adding the documentation right away, you have it in place so that you can use the documentation as you build the remainder of the application To document the property: 1 Open the class in the Code Editor 2 Move the insertion point immediately before the word Public in the Public Property statement 3 Type three comment markers, de ned in Visual Basic as apostrophes ('''), and press the Enter key The XML comments feature automatically creates the structure of your property documentation as follows: