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When you compile the program, you will get a compiler error because the keyword to declare an integer is misspelled. Using the IDE dramatically reduces your syntax errors. Depending on how the IDE is configured, any code element that isn t recognized is underlined. If Auto List Members is turned on (Tools Options Text Editor All Languages), the incidence of syntax errors is further reduced. Check the Show All Settings checkbox (and leave it checked) to see these menu options. If any syntax errors remain or if you are using a different editor, then any syntax errors will be caught by the compiler every time you build the project. It is very difficult for a syntax error to slip by into production code.
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When the compiler finds a syntax error, an error message containing the location of the error and a terse explanation will be displayed in the Output window of the IDE. If the error is caused by something such as an unbalanced parenthesis or bracket, or a missing semicolon in C#, then the actual error may not be on the reported line.
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More problematic, and often more difficult to catch, are errors in logic. The program successfully compiles and may run perfectly well most of the time, yet still contain errors in logic. The very hardest bugs to find are those that occur least often. If you can t reproduce the problem, it is terribly difficult to find it. While you will try to eliminate all the bugs from your code, you do want your program to react gracefully when a subtle bug or unexpected problem rears its ugly head.
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To demonstrate what happens if there is no error handling in place, modify the sample project from this chapter to force some errors. Go to the code-behind file. Find the For loop that populates the DropDownList in the Page_Load method. Change the test expression to cause an error intentionally at runtime. For example, change the line:
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For i As Integer = 0 To books.GetLength(0) - 1
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For i As Integer = 0 To books.GetLength(0) + 1
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When this code runs, it will try to add more items than have been defined in the books array, thus causing a runtime error. This is not a subtle bug, but it serves to demonstrate how the system reacts to runtime errors. When you run this example in the IDE, execution will stop at the line causing the error, as shown in Figure 8-17, preventing you from seeing the error page. Just press F5 to continue running, or click the Debug Continue menu item to get to the error page. Let the program run. As expected, an error is generated immediately, and the generic ASP.NET error page is displayed to the user, as shown in Figure 8-18. This generic error page is actually fairly useful to the developer or technical support person who will be trying to track down and fix any bugs. It tells you the error type, the line in the code that is the approximate error location, and a stack trace to help in tracking down how that line of code was reached. You can replace this detailed error page with a custom error page and can control who gets to see what by setting the mode attribute of the CustomErrors element in the configuration file, as will be described next.
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8: Errors, Exceptions, and Bugs, Oh My!
Application-Wide Error Pages
The previous section showed the default error pages presented for unhandled errors. This is fine for a developer, but if the application is in production, it would be much more aesthetically pleasing if the user were presented with an error page that looked less intimidating. The goal is to intercept the error before it has a chance to send the generic error page to the client. This is done on an application-wide basis by modifying the configuration file, web.config. The error-handling configuration information in web.config is contained within the <customErrors> section within the <system.web> section, which is contained within the <configuration> section. A typical <customErrors> section will look like Example 8-5.
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