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Central to the .NET platform is a development environment known as the .NET Framework. The framework provides a lot of features, but for now all you need to know is that the C# language provides you with the elements that allow you to access the framework to make your programs work. You will learn about these elements in the chapters ahead.
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1: C# and .NET Programming
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The .NET Framework sits on top of any flavor of the Windows operating system. The most important components of the framework are the CLR, which is what allows you to compile and execute applications, and the Framework Class Library (FCL), which provides an enormous number of predefined types or classes for you to use in your programs. You will learn how to define your own classes in 7.
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Detailed coverage of all the FCL classes is beyond the scope of this book. For more information, see C# 3.0 in a Nutshell by Joseph Albahari and Ben Albahari (O Reilly), and the MSDN Library (http://msdn. microsoft.com/library).
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The C# Language
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The C# language is disarmingly simple, which makes it good for beginners, but C# also includes all the support for the structured, component-based, object-oriented programming that one expects of a modern language built on the shoulders of C++ and Java. In other words, it s a fully featured language appropriate for developing large-scale applications, but at the same time it is designed to be easy to learn. A small team led by two distinguished Microsoft engineers, Anders Hejlsberg and Scott Wiltamuth, developed the original C# language. Hejlsberg is also known for creating Turbo Pascal, a popular language for PC programming, and for leading the team that designed Borland Delphi, one of the first successful integrated development environments (IDEs) for client/server programming. The goal of C# is to provide a simple, safe, object-oriented, high-performance language for .NET development. C# is simple because there are relatively few keywords. Keywords are special words reserved by the language that have a specific meaning within all C# programs, including if, while, and for. You ll learn about these keywords in the coming chapters. C# is considered safe because the language is type-safe, which is an important mechanism to help you find bugs early in the development process, as you ll see later. This makes for code that is easier to maintain and programs that are more reliable. C# was designed, from the very start, to support object-oriented programming. In this book, we ll explain not only how to write object-oriented programs, but also why object-oriented programming has become so popular. The short answer is this: programs are becoming increasingly complex, and object-oriented programming techniques help you manage that complexity. C# was designed for .NET, and .NET was designed (in part) for developing web and web-aware programs. The Internet is a primary resource in most .NET applications.
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The C# Language
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Your First Program: Hello World
At the most fundamental level, a C# application consists of source code. Source code is human-readable text written in a text editor. A text editor is like a word processor, but it puts no special characters into the file to support formatting, only the text. You could use any old text editor to write your code, but since you ll be using Visual Studio throughout this book, that s the best choice. Start up C# Express or Visual Studio. The first thing you ll see is the Start Page, which will look similar to Figure 1-2.
There s a lot of news in the middle, which you don t need to pay attention to right now. We ll give you a full tour of the Visual Studio interface in 2, but for now you need the Recent Projects box on the left. If you just installed Visual Studio, that box is empty at the moment, because you haven t created any projects yet. That s about to change. Click Project, next to the Create link. The New Project dialog box opens, as you can see in Figure 1-3. There are lots of options here that we ll discuss later, but for now we just want to get you started. Select Console Application from the row of templates at the top. When you do that, the content of the Name field at the bottom will change to
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