DEBUGGING YOUR WEBSITE in VB.NET

Drawing PDF417 in VB.NET DEBUGGING YOUR WEBSITE

CHAPTER 12 DEBUGGING YOUR WEBSITE
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Step Over
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The Step Over method executes the next line of source code; however, the main difference is that it will not navigate down into a separate method or function. The method or function will be executed and the value will be returned. Using this kind of debugging navigation can speed up the debugging process because it does not take you through a possible set of methods and functions. This is helpful when you determine that the error or exception is not occurring within one of these methods or functions. To demonstrate, we will use the same code. However, instead of actually running the debugger into the WriteToBrowser method, we will use Step Over and you will see that the same result will be achieved. Keep the breakpoint that was set in the last section and run the project. When you encounter the breakpoint, click on the middle arrow icon within the Debug toolbar as shown in Figure 12-8.
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Figure 12-8. Step Over As opposed to the debugger stepping into the WriteToBrowser method, by clicking on the Step Over method, the same result will occur.
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Step Out
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The Step Out method is typically used after using the Step Into method. To be more precise, oftentimes when you are debugging code and stepping into a method or function, there will be an instance when you want to return to the section of code where the method or function was called. The reason for this is that when looking for a bug and stepping into a method, there will be occasions where the bug is not found in the method and you need to continue from where the method was called. This can easily be performed by clicking the Step Out navigation method. As you might have guessed by now, the icon is located at the right of the three debugging navigation icons, as shown in Figure 12-9. Again, you will use the Step Out method after using the Step Into navigational method. When the execution of the code hits the breakpoint and steps into the method, you continue to step into the code; however, at the end of the method, you can click the Step Out method to return to the code that called the method or function.
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CHAPTER 12 DEBUGGING YOUR WEBSITE
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Figure 12-9. Step Out
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Debugging Windows
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Now that we have examined adding or inserting breakpoints within the code along with navigating throughout during break mode, there are some other tools available that will really help your debugging efforts. These tools come in the form of different windows in which you can analyze the data, objects, and variables within the code. These different windows are the Quick Watch window, Watch window, Locals window, Immediate window, and Call Stack window.
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Quick Watch Window
The Quick Watch window is slightly different than its counterparts in that it really doesn t resemble a window but works more like a tool tip instead. However, it does provide a great deal of information. The Quick Watch window looks at a single object or variable to examine its details further. You have actually already used this tool earlier in the breakpoints section. To use the tool again, while in break mode, simply hover the cursor over a variable or object. Let s try this with our example code as shown in Figure 12-10.
Figure 12-10. Quick Watch window You can immediately see the evaluated variable. At this point, it is clear that this tool will prove to be very useful. However, there is another aspect you can use to examine the value of the variable or object in further detail. Within the tool tip, notice the magnifying glass and the small arrow. Click on the small arrow and notice the additional choices (Figure 12-11). The additional choices given are Text Visualizer, XML Visualizer, and HTML Visualizer. These options are ways to view the data or information being examined in different formats.
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