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1 Introducing Microsoft Visual C# 2008 Express Edition
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What Is .NET , 2 What Is C# , 4 What Is Visual C# 2008 Express Edition , 10
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Maybe you ve decided to try programming and find yourself with this book. If that s the case, you ve come to the right place. This book is all about introducing you to the art, science, and joys of creating software for Microsoft Windows yes, the same Microsoft Windows you probably use every day. Throughout the book, I ll show you how to build applications that are similar to many of the applications you use on a regular basis, such as your Internet browser, your word processor, your e-mail software, and your personal finance application. You re probably wondering how you could possibly do this with no programming experience. Don t worry. By the time you finish this book, you ll be a believer. We ll have a blast, and because you ll actually be building applications as you follow along with each exercise, you ll see for yourself just how easy it can be.
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What Is .NET
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What is this .NET thing everybody is talking about Maybe you ve seen the term somewhere online or come across it in the jobs section of your Sunday newspaper. A good analogy is that .NET also called the .NET Framework is to a software developer what tools and manuals are to an auto mechanic. Here is a formal definition of the .NET Framework: The .NET Framework is a platform with which you can develop software applications and libraries called managed applications; it provides you with the compiler and tools you need to build, debug, and execute managed applications. For our purposes, you could say that .NET is the platform that gives you everything you need to develop and run managed applications that run on Windows. We say that applications are managed because their execution is managed by the .NET Framework. In fact, the .NET Framework manages the execution by providing a controlled runtime environment that offers a wide variety of services, such as loading your applications, managing memory, and monitoring and maintaining security and integrity while the application runs. Before .NET (and Java), applications were unmanaged because they were not executed by a controlled runtime environment. No other component of the operating system provides the services .NET offers. The applications had to manage their own services, which sometimes led to erroneous code, security holes, and data corruption. Because of these problems, applications were tough to maintain and debug. The .NET Framework provides you with a wide variety of tools, such as compilers, debuggers, programming languages, an execution engine (named the Common Language Runtime [CLR]), developer tools, and a large number of predefined building block libraries. These libraries are named Framework Class Libraries (FCLs). You can think of each .NET component as a building block in a house and each version of .NET as an insulation layer in the walls of the house. Figure 1-1 illustrates how many versions of .NET are out in the market, what components have been added, in which version they belong.
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NOTE
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Throughout this book, I ll use the terms framework and .NET Framework synonymously.
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Microsoft Visual C# 2008 Express Edition: Build a Program Now!
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Visual Studio 2008
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NET 3.
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NET 3 .0
NE T 2 .
CLR WinForms Web Services ASP.NET
NOTE
WCF WF
WPF CardSpace LINQ AJAX REST
Figure 1-1 Additive versions of the .NET Framework
What do the other abbreviations and names in Figure 1-1 mean WF is the Windows Workflow Foundation, another building block that developers can use to help automate business processes through programs. CardSpace is a technology related to managing online identities something like using a credit card. AJAX (Asynchronous JavaScript And XML) is used to develop Web applications, and REST (Representational State Transfer) is a programming architecture used for transferring data on the Web.
Some of these building blocks ship with the Windows Vista operating system. Two popular ones are Windows Presentation Foundation (WPF) and Windows Communication Foundation (WCF). WPF is a library that helps you build richer user interfaces and Windows Vista like applications for Windows. WCF, as its name implies, is a library that helps two applications talk to each other using messages. To understand the relationship between .NET 3.0 and .NET 3.5, remember that .NET 3.0 comes with Windows Vista and .NET 3.5 comes with Visual Studio 2008. Language Integrated Query (LINQ), which simplifies writing code that manipulates data from various data sources (SQL Server databases, XML files, and so on), is one of the features in .NET 3.5 that we ll cover in this book.
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