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ost of the programs shown in this book are console applications Console applications are good for demonstrating the elements of the C# language and are appropriate for some types of utility programs, such as file filters Of course, most modern applications are designed for the Windows graphical user interface (GUI) environment, and this book would seem incomplete without demonstrating how to use C# to create a Windows application Therefore, it is the topic of this, the final chapter in the book In the past, creating a Windows application was a challenging endeavor It was not uncommon for a newcomer to spend several weeks just learning the basic elements and architecture of a Windows application Fortunately, C# and the NET Framework changes all that The NET Framework contains an entire subsystem devoted to Windows programming called Windows Forms The primary support for Windows Forms is contained in the SystemWindowsForms namespace Through the use of Windows Forms, the creation of a GUI-based Windows program has been greatly simplified, and the entire development process has been streamlined Before we begin it is important to emphasize one point: Windows programming is a very large topic, with entire series of books devoted to it It is not possible to describe all aspects of it in a single chapter, nor is it possible to examine the classes, interfaces, properties, structures, and events in SystemWindowsForms in detail There are just far too many Instead, this chapter provides a jump-start to form-based Windows programming It explains how to create a window, create a menu, implement a button, and respond to a message Although these topics just scratch the surface of Windows programming, they will give you a base upon which to advance to other aspects of forms-based Windows programming

To appreciate the benefits that C# and the NET Framework bring to Windows programming, it is necessary for you to understand a bit of its history When Windows was first created, programs interacted directly with the Windows Application Programming Interface (API),

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SOLUTION As usual, we think of the region under y = x 2 and above the x-axis as composed of vertical segments or strips The segment at position x has height x 2 Thus, in this instance, h = x 2 , r = x, and the volume of the cylinder is 2 x x 2 x As a result, the requested volume is V =

Part II:

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which is an extensive set of methods defined by Windows that programs call to access the various functions provided by Windows API-based programs are very long and complicated For example, even a skeletal API-based program requires about 50 lines of code API-based programs that perform any useful function have at least several hundred lines of code, and real applications have several thousand lines of code Thus, in the early days, Windows programs were difficult to write and maintain In response to this problem, class libraries were created that encapsulated the functionality of the API The most important of these is the Microsoft Foundation Classes (MFC) Many readers of this book will be familiar with MFC MFC is written in C++, and MFC-based programs are also written in C++ Because MFC brought object-oriented benefits, the process of creating a Windows program was simplified However, MFC programs were still fairly complicated affairs, involving separate header files, code files, and resource files Furthermore, MFC was only a thin wrapper around the API, so many Windows-based activities still required a significant number of explicit program statements C# and the NET Framework s Forms library offer a fully object-oriented way to approach Windows programming Instead of providing just a wrapper around the API, the Forms library defines a streamlined, integrated, logically consistent way of managing the development of a Windows application This level of integration is made possible by the unique features of the C# language, such as delegates and events Furthermore, because of C# s use of garbage collection, the especially troubling problem of memory leaks has been nearly eliminated If you have already programmed for Windows using either the API or MFC, you will find the Windows Forms approach remarkably refreshing Windows Forms makes it nearly as easy to create a Windows application as it is to create a console application.

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