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Imagine the power of creating an environment that reports on its progress, its errors, and its warnings It s easy to think of Windows applications that do just this If you look into the Event Log of Windows 2000, you will see a lot of valuable program and service information By implementing tracing, you are providing this same functionality for your application In a large, multi-tier application, this information could be critical to the system analyst If you examine the NET documentation, you will find that the members of the Trace class are identical to the Debug class Microsoft intends that you use the Debug class during your debug builds and the Trace class for all builds EXAM TIP Remember that Debug code will not be added to anything except debug builds Therefore, your execution code will be free of Debug statements Trace code, on the other hand, is intended for runtime execution code, so, by default, tracing is enabled within the Visual Studio NET development environment To enable it otherwise, you add #define TRACE to your code or add the /d: trace switch to the command-line compile TIP You want to ensure that good tracing code is added to a production application By using trace switches, you control how much actual tracing is done In the past, tracing caused a lot of output overhead Consider the example of an application with tracing enabled that outputs to a trace log file every time a particular field is accessed The output file could become enormous, depending on the usage By ensuring that you follow good tracing practices, as defined in the next section, and that you employ trace switches carefully, you will provide administration with valuable output information about your application Adding Trace Switches As we have mentioned, tracing can cause an exorbitant amount of output if not controlled properly As a result, Microsoft developed a TraceSwitch class in the SystemDiagnostics namespace to let you dynamically set the level of tracing There are five tracing levels: 0 1 2 3 4 None Errors only Warnings as well as errors Information messages (and warnings and errors) Verbose as its name suggests, everything.

TIP You can use the TraceLevel enumeration to replace the numbers with words Off, Error, Warning, Info, and Verbose In order to set the switches, you must edit the XML configuration file of your application (<program name>EXEConfig) as follows:

<configuration> <systemdiagnostics> <switches> <add name="Switch1" value="Error" /> <add name="Switch2" value="Warning" /> </switches> </systemdiagnostics> </configuration>

The safety committee s investigation of a fatal accident is conducted with a view to: (Mark the best answer) A Determining if criminal charges are involved B Establishing if there has been any horse-play on the part of employees C Determining the cause to prevent future accidents D Finding out who is to blame for the mishap

Within your program, you must also create the TraceSwitch object using the same name as in the configuration file (Switch1 and Switch2 in the previous example) This is how the two pieces fit together:

TraceSwitch ts = new TraceSwitch ("Switch1", "This is just a description parameter");

Notice that the constructor of the TraceSwitch class takes as its first parameter the actual name of the switch This must match the name used in the configuration file The second parameter of the constructor is simply a description for documentation purposes Once the switch object is created, you can use it to provide tracing output The next code snippet is for demonstration purposes and checks the setting of the switch and conditionally outputs a message:

51 A corner position provides a better view of traffic than a center-of-the-intersection position A True B False

TraceWriteLineIf (tsTraceError, "Tracing for errors is set");