Figure 1-3 Use case in .NET

Printing QR Code 2d barcode in .NET Figure 1-3 Use case
Figure 1-3 Use case
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Under this scenario, you must present a list of courses to the customer, and then the customer can choose one course and register for it During the registration, not only must the participants entered by the customer be added to the list of attendees, but the customer balance also must be reduced by the course priceand if the customer does not already have a balance available, a receipt has to be prepared This scenario requires you to add some business logic to the process You can do so by using custom components The components are part of a business process, so call them business components Instead of implementing the code accessing the database directly in the UI forms classes, these components are used from the UI, and the data access components serve the role of accessing the database
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Application Layers
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In this scenario, for reuse and scalability, you should separate the functionality of the application into the application layers, shown in Figure 1-4
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Figure 1-4 Application layers
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Presentation Services
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The role of the presentation layer is to offer a UI that displays to the user With NET technologies, you can implement presentation services using rich client applications with Windows Forms or thin clients with ASPNET Web Forms Windows Forms offer a rich user experience in which you can use the processing power of the client systems With rich client applications, many round trips to the server are not required, because you can build a lot of functionality in to the application running on the client system In contrast to previous technologies where installing such applications was a headache for the system administrators in a big user environment, you can seamlessly install client applications with NET; only the NET runtime is required on the client system You just have to include a link inside an HTML page referencing a Windows Forms application on the Web server to install the application on the client system This technology is known as ClickOnce deployment (formerly known asno-touch deployment) When the user [1] opens the page with Internet Explorer and clicks the link that references the Windows Forms application, the application is automatically installed on the client system While the application is running, it can check for updates on the server to download new assemblies dynamically With ClickOnce deployment, you just have to think about the security configuration By default, what can be done on the client systemif the assembly is installed from the Internetis very restrictive Applications do not have permissions to harm your computer Rich clients can also install applications in the usual way via Windows Installer on the client system but use an automatic update by receiving new assemblies from a Web service
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Business Services
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Instead of mixing the business logic directly with the code of the UI, you can separate the business logic into its own classes Putting these classes into separate assemblies makes it easy to reuse the business logic from multiple parts of the application and in other applications In the previously described scenario, you can first separate the UI from a business component that is responsible for ordering courses The course order requires a combination of activities: creating a receipt and adding the attendees to the course list You can split these activities into multiple components, CourseControl and ReceiptControl, as shown in Figure 1-5 These components can also be used from other parts of the application or from other applications
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Figure 1-5 Business components
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Business components can make use of Enterprise Services As you learn in this chapter about the various services this technology offers, you can decide whether you can improve your application via these services
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