BUILDING THE BUSINESS LOGIC LAYER in VS .NET

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5 BUILDING THE BUSINESS LOGIC LAYER
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You normally de ne one class for each key thing involved with the application For example, the Purchase Tracker sample application has products, customers, and purchases The products map to a Product class, with properties to manage product information and methods to retrieve, save, and perform any other required processing on product information The customers map to a Customer class, and so on For more information on de ning classes for your application, see 2 You can also de ne classes for other implementation logic For example, you could create a class to manage application logging or security These implementation-based classes were also discussed in 2
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Building the Business Logic Layer
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This section details the process of creating a class You can use these techniques to create each class needed by your application
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Adding a Class to a Project
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There are many ways to add a class to a project As discussed in the preceding chapter, adding a form project item actually adds two class les to the project It adds a class in one le with a vb extension and a partial class in another le with a designervb extension When building the business logic layer, you normally add one class project item for each business object class (such as Product and Customer) and one for each implementation class (such as Logging and Security)
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NOTE: You may want to define standard implementation classes in a separate utility component instead of in the business object component That way, it can more readily become a part of your reusable framework, as discussed in 2
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To add a class to a project: 1 Right-click the project in Solution Explorer and select Add | New Item from the context menu, or select Project | Add New Item from the main menu bar Alternatively, you could select Add | Class from the context menu, or select Project | Add Class from the main menu bar 2 Select the Class template, name the class, and click the Add button If you created your own class template using the steps in 3, you can use your template here Use standard naming conventions for your class name The most common standard is to name the class using the singular name of the business entity or implementation feature represented by the class For products the class name would be Product, for logging the class name would be Logging, and so on Visual Studio creates the class le with a vb extension, adds it to Solution Explorer, and then displays the class in the Code Editor
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Creating a Class
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When Visual Studio creates the class le, it automatically generates the class declaration as follows:
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Public Class Product End Class
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You can add any number of classes to your projects as needed by your application Regardless of the class s purpose or location, the basic process of building a class is the same
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NOTE: Throughout this chapter, classes are created in the business object Class Library project You can use these same techniques to add classes to other parts of your application For example, your Windows Application project may require classes to manage user interface features such as standard grid processing Or you may create a utility or general library component that requires classes
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5 BUILDING THE BUSINESS LOGIC LAYER
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For the Purchase Tracker sample application: Visual Studio created a default class for you when you created the business object Class Library project (PTBO) In Solution Explorer, change the name of this default class from Class1 to Product When you change the name of a class in Solution Explorer, Visual Studio changes the class name in the Code Editor accordingly NOTE: When you change the class name in Solution Explorer, Visual Studio modifies the class name in your code only if the class name matched the name defined in Solution Explorer For example, say you don t modify the class name in Solution Explorer, but you instead change the name directly in the class file If you later change the name in Solution Explorer, it does not change the name you entered in the class file
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