The Trace.WriteLine calls are left in your code even after release. So, we need a way to control when they are output. We can do this with a trace switch.
The value of a trace switch can be set using a number or a word. For example, the number 3 can be replaced with the word Info, as shown in the following table:
| Number | Word | Description |
| 0 | Off | This will output nothing |
| 1 | Error | This will output only errors |
| 2 | Warning | This will output errors and warnings |
| 3 | Info | This will output errors, warnings, and information |
| 4 | Verbose | This will output all levels |
Add some statements to the end of the Main method to create a trace switch, set its level using a passed command line parameter, and then output the four trace ...
