9: Debugging and Testing
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3 Write your trace messages 4 In your configuration file, configure the trace switches Trace Output in ASPNET By setting page-level tracing in ASPNET,
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(<%@ Page Trace="true"%>) you can set up debugging statements to print directly to the page s output The page exposes a property of the Trace class called SystemWeb TraceContext, which captures execution details about a web request You can then use this to write out trace information using the standard TraceWrite() methods TIP Trace output can be set conditionally through the Trace="true" or Trace="false" statements Application tracing is set within the webConfig file This will allow you to set tracing across multiple pages, rather than just for one as with page-level tracing The output details will be written to the trace viewer application, traceaxd This is an HTTP handler that you can use to view the details of the trace PART II
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Debugging an ASPNET Application
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This section will demonstrate the additional steps required to set up debugging for ASPNET applications Of course, in Visual Studio NET, you can utilize any of the tools that we have discussed so far The following steps must be taken in order to debug an ASPNET application: 1 Start the application by navigating to the defaultaspx page 2 Attach to the debugger program DbgCLRexe 3 ASPNET is a system process, and you will need to attach the debugger to the process a In the Tools menu, select Debug Processes b Check the Show System Processes check box in the Processes dialog box (see Figure 9-12) c In the Available Processes list, select aspnet_wpexe, which is the ASPNET system process d Click Attach 4 You can now open your aspx and cs files and set breakpoints as needed 5 Return to the browser and refresh your page You will then be placed back into the debugger program and will be able to view the windows available Locals, Watch, and so on
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What we have been discussing so far are methods to look for errors, present informational messages, and so on, either while your program is in a debug build or in production Another important area of concern is that of testing your application When we speak of testing in this context, we are not referring to the testing that catches program bugs, per se, but rather the testing that checks the types of input that can be expected and observes its results In this section, we will be looking at the purpose of testing and then will move into creating a test plan for your application EXAM TIP One of the objectives of both Microsoft C# exams is to Create a unit test plan Be sure to pay particular attention to that section
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Purpose of Testing
When you present a software package to the public for its consumption, you need to be particularly sure that the quality is top-notch In order to ensure that, you ll want to employ good testing techniques prior to releasing your software
9: Debugging and Testing
There are several advantages of good testing: Reduced cost of development You will have anticipated the type of testing as you move along in the process By leaving the testing until the end of the project, you risk an enormous amount of time overhead Good market product The testing that you do will ensure that your code does what it promises Your customers will look forward to dealing with you again Less maintenance time Because you have anticipated most of the situations that can occur, you will reduce the amount of time spent on maintaining the application The testing process does not start when the code is written and ready for market Good testing means that you initiated the process from the very start of development In order to accomplish this, you will need to create a testing plan that is viable and workable As a suggestion, we will be showing you a unit test plan that has had proven success in the testing field for many years EXAM TIP Microsoft s expectation on the exam is that you are aware of this type of test planning and understand its implementation