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Generation Code-39 in Visual Basic .NET 7: Fixing the Broken Blocks

7: Fixing the Broken Blocks
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Figure 7-1 Add Reference menu choice from the Debugger project
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A using directive does not give you access to any namespaces that are nested in the namespace you specify.
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For instance, Console.WriteLine() comes from the System namespace; by adding it on top, you don t have to type System.Console.WriteLine(). This saves time, and it s easier to read. By adding this line of code, you re telling Visual Studio to look into that assembly for the metadata that will enable IntelliSense to be populated with the public/protected elements. After adding this line, you ll have access to those items whenever you have an instance of one of the types built in the library.
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Using Breakpoints, Locals, Edit and Continue, and Visualizers
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There is no better way to dive into this subject than by going through the code. If the TestApplication.cs source code file is not already open, open it by right-clicking the TestApplication.cs file and selecting View Code. You should see red dots on the left side of the screen; those red dots are breakpoints. Figure 7-3 shows the source code and the breakpoints.
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If the breakpoints don t appear, you can add them by clicking in the left margin.
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Figure 7-3 Source code and breakpoints from the TestApplication Windows form
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When the debugger encounters a breakpoint, it stops executing the application. In this source code, one breakpoint is placed on the call to MessageBox.Show(myString);. Another
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Microsoft Visual C# 2008 Express Edition: Build a Program Now!
breakpoint appears in Library.cs in the first line of code of the Divide method. In the following procedure, you will execute the code and go through a debugging session. To debug an application, you can do one of the following: Press F5, or click the Start Debugging button. The program will start executing normally. If there is a breakpoint in the source code, the execution will stop there. Otherwise, the program will continue to execute unless there is an unhandled exception or error. Alternatively, you can debug the application by stepping through the code line by line. To do this, press F11, or click the Step Into button. For now, you ll jump to the first breakpoint and execute the code in the sample program using the first technique.
TO BEGIN DEBUGGING AN APPLICATION
1. Press F5, or click the Start Debugging button. 2. You will see a Try Me! Button. Click it. The code should stop executing at the first breakpoint in the Divide method, and you should see what is shown in Figure 7-4. The yellow highlighted line indicates the next statement to be executed.
Figure 7-4 You re now in debugging mode, so you have access to a plethora Execution stopped at the first breakpoint in the Divide method of tools and data elements about your application to help you understand what is happening when your application is executed. You can see the content of local variables, parameters, exception messages, the console window, and many more items you ll discover in the next few pages. All that information is useful when an application is not behaving the way it should and you re trying to understand why. With all the information the debugger provides, you can try to uncover where the problem lies and see why you have a bug. You can also use the debugger for learning purposes as you are doing right now. The debugger is an excellent teacher when you re new to a technology, when you re new to a language construct, or when you re simply trying to understand a new element. It is also common to use the debugger to understand someone else s code, and it is especially helpful when you need to modify existing code.
7: Fixing the Broken Blocks
You ll now look at the first series of data elements offered by the debugger while you re stepping through your code. At the bottom of the Visual Studio screen, you can see a series of tabs, which can include Locals, Watch, Immediate Window, Output, and Error List. If you don t see these tabs, you can open these tabs by selecting them in the View and Debug menus. Most of these are not visible when you re working in editing mode. While you re debugging, the Locals tab is usually on top and shows the current variables and object information. Beside it you ll see the Call Stack that displays all methods that have been called, enabling you to follow the execution of your application at any given point during the debugging. Figure 7-5 shows the two windows.
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