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This chapter is an introduction to creating front-end application code in Visual C# NET If you have developed in Visual Studio 6, you are already aware of the capabilities of the integrated development environment (IDE) Although it is possible to develop Windows applications outside of Visual Studio NET, working within Visual Studio NET is usually the best option as the IDE is loaded with assistance and shortcuts that help to reduce the amount of time you will spend coding and designing The NET Framework provides many classes for building Windows applications, and we will explore some of them in this chapter In particular, we will spend time looking at the SystemWindowsForms namespace, which is the cornerstone of application development in Windows We will also introduce you to the application that we will use in this section of the book to demonstrate Windows development We will be creating a college registry database application that keeps track of students, instructors, and courses The application will allow the user to interface with the back-end database In this chapter, we will introduce form design, place controls on our form, and react to the events that are generated

The NET Framework has provided Windows developers with a new platform on which to create applications Windows Forms By using this platform, developers can create Windows applications, front-end interfaces for multiple-tiered applications, and front-end interfaces for client applications Anything that requires user intervention can be placed inside a Windows Form If you have just finished Part III of this book, you may be won-

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dering when to use Windows Forms and when to use Web Forms The key distinction for deciding which one to use is this: If you need an application that can interact with the underlying resources of the system, and you know that you want a lot of the processing to take place on that machine, you need a Windows Form application ASP NET Web Forms are used when your application needs to run in a browser Windows Forms examples include: A fast response application, like a point-of-sale system The register needs to be very fast and not dependent on the network connection The front-end can still connect to a middle-tier or third-tier database, but the calculations and decision-making processing happens on the client Data-entry programs In order to provide the very fast response that is expected of data-entry programs, the work needs to be done on the client Data can be sent across a network, validated, and returned at the same time as the user is entering new data The need here is for quick response, and a Windows application provides that A graphics application In order to get the quality, high-performance display, the client needs to quickly interact with the operating system A Windows Form application can do that A Windows game This type of application needs fast access to the underlying graphics classes that enrich the interface ASP NET Web Form examples include: An application that must be platform independent If your application needs to be visible on any machine that has a network connection, you must have a Web Form E-commerce applications For web-based business, a Web Form allows user interaction with the middle and back tiers of your application Intranet applications If your company has internal applications that provide services to employees, a Web Form means that no extra software needs to be installed on the client machines However, sometimes the distinction is not as simple as in these examples If you are interested in learning more about the engineering of front-end applications, we suggest that you find a book on design principles The Microsoft exams are not going to test you on whether you need to use a Windows Form or a Web Form Since the two exams are distinct and separate from each other, we have chosen to present the information for the Windows exam in this part of the book (Part IV) and the web exam in Part III.