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P A R T
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The C# Language
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There are two parts to learning a new programming language: the language itself and the libraries that it comes with. This part of the book is concerned with the C# language the keywords, the operators, and how you can perform basic programming tasks such as creating a variable, performing a calculation, and defining and using a new data type. There is a lot of detail in the chapters in this part of the book, and some of the chapters are relatively long. It is easy to be overwhelmed by C#, especially if you are new to object-oriented programming and have not used a similar language such as C++ or Java. I have included lots of code samples to put things in context and diagrams that show you how C# language features are used. My advice is to spend time getting to know the content in the early chapters well. 4 sets out the fundamentals of C#, which are then covered in detail in the chapters that follow. If you start to lose track of the detail, then I recommend going back to s 4 9 to ensure that you have a solid foundation in the language basics. You should pay particular attention to 6 if you are new to object-oriented programming. There are a set of very common programming errors that you can avoid by gaining a good grasp on the difference between reference types and value types this is a difference that bedevils new programmers. If you have used a similar language (such as C++ or Java), then you ll find C# has a lot of similar features, but even so, I recommend taking the time to learn about the C#
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features that other common languages do not have or which differ significantly, such as properties and delegates. A programmer new to a language tends to stick to just the features that are similar to the old language, and that would be a shame when programming in C# because there are some nice aspects that make common programming problems easier to solve.
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CHAPTER 4
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C# Fundamentals and Keyword Reference
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In this chapter, we will look at some of the most fundamental aspects of C# the syntax, the type system, and the set of keywords and operators. We ll also look at some of the most common tasks a programmer must perform and how they can be written in C#. This chapter is full of references to other chapters. This chapter will set out the overall structure, but you should read the other chapters to get into the detail. This is a long chapter, and it may take you some time to work your way through all of the examples, but it is time well invested, because the topics covered in this chapter are some of the most important C# building blocks. There can be a lot to take in when learning a new language, but don t feel overwhelmed. If you do find that you struggle to take in all of the new information, then I recommend downloading the code samples for this chapter (available for free from Apress.com) and experimenting to see how the examples compile and run.
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Language Fundamentals
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In the following sections, we ll use a simple C# program to introduce the various elements of the C# language syntax, such as identifiers, keywords, literals, and so on. We will then look at the C# type system, in particular the differences between reference and value types. Understanding this difference is critical to effective C# programming, and it causes programmers new to C# a lot of confusion and problems.
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A Simple C# Program
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The best place to start with a programming language is to look at a program. Listing 4-1 contains a simple C# program. Listing 4-1. A Simple C# Program using System; namespace ProjectNamespace { class Program {
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