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PART I
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Compiling the Program
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To compile the program, execute the C# compiler, cscexe, specifying the name of the source file on the command line, as shown here:
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C:\>csc Examplecs
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The csc compiler creates a file called Exampleexe that contains the MSIL version of the program Although MSIL is not executable code, it is still contained in an exe file The Common Language Runtime automatically invokes the JIT compiler when you attempt to execute Exampleexe Be aware, however, that if you try to execute Exampleexe (or any other exe file that contains MSIL) on a computer for which the NET Framework is not installed, the program will not execute because the CLR will be missing
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NOTE Prior to running cscexe you will need to open a Command Prompt window that is
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configured for Visual Studio The easiest way to do this is to select Visual Studio Command Prompt under Visual Studio Tools in the Start menu Alternatively, you can start an unconfigured Command Prompt window and then run the batch file vsvars32bat, which is provided by Visual Studio
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Running the Program
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To actually run the program, just type its name on the command line, as shown here:
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C:\>Example
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When the program is run, the following output is displayed:
A simple C# program
Using the Visual Studio IDE
Visual Studio is Microsoft s integrated programming environment (IDE) It lets you edit, compile, run, and debug a C# program, all without leaving its well-thought-out environment Visual Studio offers convenience and helps manage your programs It is most effective for larger
Part I:
The C# Language
projects, but it can be used to great success with smaller programs, such as those that constitute the examples in this book The steps required to edit, compile, and run a C# program using the Visual Studio 2010 IDE are shown here These steps assume the IDE provided by Visual Studio 2010 Professional Slight differences may exist with other versions of Visual Studio 1 Create a new, empty C# project by selecting File | New | Project Then, select Windows in the Installed Templates list Next, select Empty Project:
Then, press OK to create the project
NOTE The name of your project and its location may differ from that shown here
2:
An Overview of C#
2 Once the new project is created, the Visual Studio IDE will look like this:
PART I
If for some reason you do not see the Solution Explorer window, activate it by selecting Solution Explorer from the View menu
Part I:
The C# Language
3 At this point, the project is empty and you will need to add a C# source file to it Do this by right-clicking on the project s name (which is Project1 in this example) in the Solution Explorer and then selecting Add You will see the following:
4 Next, select New Item This causes the Add New Item dialog to be displayed Select Code in the Installed Templates list Next, select Code File and then change the name to Examplecs, as shown here:
2:
An Overview of C#
PART I
5 Next, add the file to the project by pressing Add Your screen will now look like this:
Part I:
The C# Language
6 Next, type the example program into the Examplecs window (You can download the source code to the programs in this book from wwwmhprofessionalcom so you won t have to type in each example manually) When done, your screen will look like this:
7 Compile the program by selecting Build Solution from the Build menu 8 Run the program by selecting Start Without Debugging from the Debug menu When you run the program, you will see the window shown here
2:
An Overview of C#
As the preceding instructions show, compiling short sample programs using the IDE involves a number of steps However, you don t need to create a new project for each example program in this book Instead, you can use the same C# project Just delete the current source file and add the new file Then recompile and run This approach greatly simplifies the process Understand, however, that for real-world applications, each program will use its own project
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