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The NET Framework defines an environment that supports the development and execution of highly distributed, component-based applications It enables differing computer languages to work together and provides for security, program portability, and a common programming model for the Windows platform As it relates to C#, the NET Framework defines two very important entities The first is the Common Language Runtime (CLR) This is the system that manages the execution of your program Along with other benefits, the Common Language Runtime is the part of the NET Framework that enables programs to be portable, supports mixed-language programming, and provides for secure execution The second entity is the NET class library This library gives your program access to the runtime environment For example, if you want to perform I/O, such as displaying something on the screen, you will use the NET class library to do it If you are new to programming, then the term class may be new Although it is explained in detail later in this book, for now a brief definition will suffice: a class is an object-oriented construct that helps organize programs As long as your program restricts itself to the features defined by the NET class library, your programs can run anywhere that the NET runtime system is supported Since C# automatically uses the NET Framework class library, C# programs are automatically portable to all NET environments

The Common Language Runtime manages the execution of NET code Here is how it works: When you compile a C# program, the output of the compiler is not executable code Instead, it is a file that contains a special type of pseudocode called Microsoft Intermediate Language (MSIL) MSIL defines a set of portable instructions that are independent of any specific CPU In essence, MSIL defines a portable assembly language One other point: although MSIL is similar in concept to Java s bytecode, the two are not the same It is the job of the CLR to translate the intermediate code into executable code when a program is run Thus, any program compiled to MSIL can be run in any environment for which the CLR is implemented This is part of how the NET Framework achieves portability Microsoft Intermediate Language is turned into executable code using a JIT compiler JIT stands for Just-In-Time The process works like this: When a NET program is executed, the CLR activates the JIT compiler The JIT compiler converts MSIL into native code on demand as each part of your program is needed Thus, your C# program actually executes as native code even though it is initially compiled into MSIL This means that your program runs nearly as fast as it would if it had been compiled to native code in the first

In her opening remarks, Ms Kingsley said, As I said a year ago, business is great!

1:

The Creation of C#

Calculate the volume of the solid enclosed when the area between the curves x = ( y 2) 2 + 1 and x = ( y 2) 2 + 9 is rotated about the line y = 2

place, but it gains the portability benefits of MSIL Also, during compilation, code verification takes place to ensure type safety (unless a security policy has been established that avoids this step) In addition to MSIL, one other thing is output when you compile a C# program: metadata Metadata describes the data used by your program and enables your code to interact easily with other code The metadata is contained in the same file as the MSIL

is zero");

is one");

Solving the equations simultaneously, we find that the points of intersection are ( 5, 0) and ( 5, 4) The region between the two curves is illustrated in Figure 822 At height y, the horizontal segment that is to be rotated stretches from ( ( y 2) 2 + 1, y) to ( ( y 2) 2 + 9, y) Thus the cylindrical shell that is generated has radius y 2, height 8 2( y 2) 2 , and thickness y It therefore generates the element of volume given by 2 ( y 2) [8 2( y 2) 2 ] The aggregate volume that we seek is therefore

is two");

is three");

Part I: