Writing Methods and Applying Scope in Visual Studio .NET

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Writing Methods and Applying Scope
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1. On the Debug menu, click Start Without Debugging. Visual Studio 2008 builds the program and then runs it. A console window appears. 2. At the Enter your daily rate prompt, type 525, and then press Enter. 3. At the Enter the number of days prompt, type 17, and then press Enter. The program writes the following message to the console window:
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4. Press the Enter key to close the application and return to the Visual Studio 2008 programming environment. In the nal exercise, you ll use the Visual Studio 2008 debugger to run your program in slow motion. You ll see when each method is called (this action is referred to as stepping into the method) and then see how each return statement transfers control back to the caller (also known as stepping out of the method). While you are stepping in and out of methods, you ll use the tools on the Debug toolbar. However, the same commands are also available on the Debug menu when an application is running in Debug mode.
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Step through the methods using the Visual Studio 2008 debugger
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1. In the Code and Text Editor window, nd the run method. 2. Move the mouse to the rst statement in the run method:
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double dailyRate = readDouble( Enter your daily rate: );
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3. Right-click anywhere on this line, and on the shortcut menu, click Run To Cursor. The program starts and runs until it reaches the rst statement in the run method, and then it pauses. A yellow arrow in the left margin of the Code and Text Editor window indicates the current statement, which is also highlighted with a yellow background. 4. On the View menu, point to Toolbars, and then make sure the Debug toolbar is selected. If it was not already visible, the Debug toolbar opens. It may appear docked with the other toolbars. If you cannot see the toolbar, try using the Toolbars command on the View menu to hide it, and notice which buttons disappear. Then display the toolbar again. The Debug toolbar looks like this (the toolbar differs slightly between Visual Studio 2008 and Microsoft Visual C# 2008 Express Edition):
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Step into Step over
Continue
Step out
Part I
Introducing Microsoft Visual C# and Microsoft Visual Studio 2008
Tip To make the Debug toolbar appear in its own window, use the handle at the left end
of the toolbar to drag it over the Code and Text Editor window.
5. On the Debug toolbar, click the Step Into button. (This is the sixth button from the left.) This action causes the debugger to step into the method being called. The yellow cursor jumps to the opening brace at the start of the readDouble method. 6. Click Step Into again. The cursor advances to the rst statement:
Console.Write(p);
Tip You can also press F11 rather than repeatedly clicking Step Into on the Debug toolbar. 7. On the Debug toolbar, click Step Over. (This is the seventh button from the left.) This action causes the method to execute the next statement without debugging it (stepping into it). The yellow cursor moves to the second statement of the method, and the program displays the Enter your daily rate prompt in a Console window before returning to Visual Studio 2008. (The Console window might be hidden behind Visual Studio.) Tip You can also press F10 rather than clicking Step Over on the Debug toolbar. 8. On the Debug toolbar, click Step Over. This time, the yellow cursor disappears and the Console window gets the focus because the program is executing the Console.ReadLine method and is waiting for you to type something. 9. Type 525 in the Console window, and then press Enter. Control returns to Visual Studio 2008. The yellow cursor appears on the third line of the method. 10. Without clicking, move the mouse over the reference to the line variable on either the second or the third line of the method (it doesn t matter which). A ScreenTip appears, displaying the current value of the line variable ( 525 ). You can use this feature to make sure that a variable has been set to an expected value while stepping through methods. 11. On the Debug toolbar, click Step Out. (This is the eighth button from the left.)
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