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int k = 12, h = ++a; // Legal!

.

In administering duties, which sense would almost never be used A Touch B Sight C Taste D Smell E All of the above

It is critical that programmers using the new NET programming languages understand completely the concepts behind the term object oriented (commonly written as OO) In everything that you design or code, you will be taking advantage of this style As a matter of fact, C# programs cannot be written without first designing a class file Although it is possible to get by writing code in an object-oriented environment, you should know how to properly design class files and work with the key concepts of OO, such as abstraction, encapsulation, inheritance, and polymorphism These are not just words they are a lifestyle in the programming world If you consider yourself an expert in proper class design, please skim through the rest of this chapter in order to appreciate the differences between C# and other object-oriented languages If you are looking for a refresher in OOP, you are in the right chapter Also, it is a given that Microsoft will expect you to be conversant in the ways of class design for the exam, so this is a great place to start It is to your advantage to spend some time in this chapter getting comfortable with all of the concepts For a more advanced look into object-oriented programming, you should also work through 3 If you are a newcomer to object-oriented technology, you may want to finish reading this chapter and then invest in other material to help you understand this very important reality of today s programming Whoever you are and whatever your background, OOP is here to stay Entire operating systems (Windows 2000, Windows XP, and the new NET Servers) are written using objects If you want to explore the properties and capabilities of these objects, you will need to understand how an object asks another object for information It s not only necessary to grasp these concepts for a Microsoft exam it is essential to participate actively in the new object-oriented computer world.

Notice the extra information that we receive by using the BuggyAppexe that was created with the debugger information We now have the offending line number from both the calling method and the called method After correcting line 13 and running the debugger with the command-line parameters (CorDbg BuggyAppexe 10 9), we can now step through the code to see exactly what is happening Look at Figure 9-4 to see the executable code transformed into source code (assembly code) You can see from this figure that the power in this method of debugging is the detail of the results Experiment with some of the commands that you can use in the debugger The more useful commands are as follows: l[ist] Typing the letter l (for list) lists the modules, classes, and global functions that are currently loaded p[rint] prints the current variables b[reakpoint] <line number> sets a breakpoint at the specified line number See the Breakpoints section for more information sh <number> shows the preceding <number> lines of code

TIP Use the <compilation debug="true"/> setting in the application s (or computer s) config file to accomplish debugging when using codebehind pages in ASPNET

31 Which of the following can enhance the patrolman s skill and ability (Select the best answer) A Proper training B Preparation for patrol C Professional work habits D All of the above

Figure 9-4

If you do not have Visual Studio NET installed on your system, you may prefer to run the GUI debugger, which is called DbgCLRexe It is located in the \Microsoft Visual Studio NET\FrameworkSDK\GuiDebug folder This debugger gives you a common Windows interface (see Figure 9-5) that you may find easier to use than the straight command line However, if you do have Visual Studio NET installed, you will want to use the full graphical interface utilities that come with the program