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CHAPTER 5 INTRODUCING VISUAL BASIC AND THE .NET FRAMEWORK
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Figure 5-14. Breakpoints window
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3. Right-click the breakpoint in the Breakpoints window and select Condition. You will see the Breakpoint Condition dialog box. Enter i = 3 as the condition expression and click the OK button (see Figure 5-15).
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Figure 5-15. Breakpoint Condition dialog box
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4. Select Debug Start. When the form appears, click the Load List button. Program execution will pause, and you will see a yellow arrow indicating the next line that will be executed. 5. Select Debug Windows Locals. The Locals window is displayed at the bottom of the screen (see Figure 5-16). The value of i is displayed in the Locals window. Verify that it is 3. Step through the code using the Debug toolbar, and watch the value of i change in the Locals window. Click the Stop Debugging button in the Debug toolbar.
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Figure 5-16. Locals window
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CHAPTER 5 INTRODUCING VISUAL BASIC AND THE .NET FRAMEWORK
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6. Locate the Output window at the bottom of your screen and click the Breakpoints tab. Right-click the breakpoint in the Breakpoints window and select Condition. Clear the current condition by clearing the Condition check box, and then click the OK button. 7. Right-click the breakpoint in the Breakpoints window and select Hit Count. Set the breakpoint to break when the hit count equals 4, and then click OK. 8. Select Debug Start. When the form appears, click the Load List button. Program execution will pause. A yellow arrow indicates the next line of code that will execute. 9. Right-click the NumberList statement and select Add Watch. A Watch window will be displayed with NumberList in it. Notice that NumberList is a System.Collections.ArrayList type. Click the plus sign next to NumberList. Click the plus sign next to the Items entry. Verify that the array contains three items (see Figure 5-17). Step through the code, and watch the array fill with items. Click the Stop button in the Debug toolbar.
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Figure 5-17. The Watch window
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10. To find out more about the System.Collections.ArrayList type, highlight the code statement in the code editor and press the F1 key. A Help window is displayed with information about the type.
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Locating and Fixing Build Errors
To locate and fix build errors, follow these steps: 1. In the Solution Explorer, right-click Form1 and select View Code. Locate the btnLoadList_Click method. Locate the following line of code and comment it out by placing a single quote in front of it, as shown here: 'Dim Item As Integer 2. Select Build Build Solution. A message box indicates that there were build errors and asks if you want to continue. Select no. The Error List window will appear at the bottom of the screen, indicating a build error (see Figure 5-18).
CHAPTER 5 INTRODUCING VISUAL BASIC AND THE .NET FRAMEWORK
Figure 5-18. Locating build errors with the Error List window
3. Double-click the line containing the build error in the Error List window. The corresponding code will become visible in the code editor. 4. Uncomment the line you commented in step 1 by deleting the single quote. Select Build Build Solution. This time, the Output window is displayed at the bottom of the screen, indicating that there were no build errors. 5. Save the project and exit VS.
Summary
This chapter introduced you to the fundamentals of the .NET Framework. You reviewed some of the underlying goals of the .NET Framework. You also looked at how the .NET Framework is structured and how code is compiled and executed by the CLR. These concepts are relevant and consistent across all .NET-compliant programming languages. In addition, you explored some of the features of the Visual Studio integrated development environment. The next chapter is the first in a series that looks at how the OOP concepts such as class structure, inheritance, and polymorphism are implemented in VB code.
CHAPTER
Creating Classes
n the previous chapter, you looked at how the .NET Framework was developed and how programs execute under the framework. That chapter introduced you to the VS IDE, and you gained some familiarity with working in it. You are now ready to start coding! This chapter is the first of a series that will introduce you to how classes are created and used in VB. It covers the basics of creating and using classes. You will create classes, add attributes and methods, and instantiate object instances of the classes in client code. After reading this chapter, you should be familiar with the following: How objects used in OOP depend on class definition files The important role encapsulation plays in OOP How to define the properties and methods of a class The purpose of class constructors How to use instances of classes in client code The process of overloading class constructors and methods How to create and test class definition files with VS
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