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MCAD/MCSD Visual C# NET Certification All-in-One Exam Guide
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It has been the tradition since the first book on the C language to start any text introducing a computer language with a program that prints Hello World! on the screen We will follow that tradition here is the Hello World! program written in Microsoft Visual C# NET:
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using System;
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class Hello
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public static int Main()
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ConsoleWriteLine("Hello World!");
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The program can be typed into any editor (we used Notepad) and saved in a file with a cs extension (cs is the default file extension for C#) To be able to run the Visual Studio NET command-line programs (like cscexe) you will have to have the environment properly configured The easiest way is to start the command prompt from the batch file supplied with Visual Studio NET, which you can find by selecting Start | Programs | Microsoft Visual Studio NET 70 | Visual Studio NET Tools | Visual Studio NET Command Prompt In 5, we will introduce the Visual Studio development environment, which makes your coding and testing much easier, but for the purpose of examining the details of coding, we will stick to Notepad for now It s important to note that the C# language is case sensitive You must type everything exactly as listed In order to create an executable file for the Hello World! program, you will have to compile the code into IL The C# compiler will do that for you from a command line just enter cscexe Hellocs You may also want to work with the integrated development environment (IDE) for Visual Studio If this is your first time working with a Visual Studio release, refer to 5 for assistance NOTE For the complete syntax of the csc program, see Appendix C
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Let s have a quick look at the five lines of code (shown previously) that display Hello World! in a console window If you are familiar with C++ or Java, the program should look fairly readable, but there are some gotchas that you should be aware of The first line (using System;) tells the compiler and runtime system where to search for library entries This is very similar to the Java import keyword
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CAUTION The C++ #include statement is not the same as the C# using statement, since the using statement does not insert any code into the executable The #include used in C/C++ actually reads the content of the include file into the source file
1: Introduction to C# NET and the NET Platform
In C#, everything is a class Keep this statement in mind as you create your programs in C# In reality, you are not creating traditional programs Instead, you are creating classes you ll get a complete explanation of class files in the Object-Oriented Programming Concepts section of this chapter In our example, the line class Hello is the definition of a new class called Hello Every executable program must have one and only one entry point (an entry point being the start of execution) In our program, the entry point is the third line: public static int Main() The four parts of the method Main() will be explored later in this chapter In order to print Hello World! on the screen, we use the System libraries (which were referred to by the using statement) All input and output is handled through these libraries The object that we interact with is the Console and the method that prints data on the console is the WriteLine() method The line ConsoleWriteLine("Hello World!"); calls the WriteLine() method of the Console class in the System library Congratulations! You have just written your first C# program If only everything else were that simple! However, before we complicate things, let s examine the basic concepts of C# in more detail Again, this is just a cursory look we are assuming that you are quite familiar with these concepts and are just looking for an explanation of their handling within the C# language The csc program produces an executable file (helloexe) that can be run directly from the command line (see Figure 1-3) PART I
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