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Because VBA will execute an entire procedure until the end is reached, it is necessary to include instructions so that VBA will skip any error handlers you have written if no error has been trapped. The most common way to cause VBA to avoid executing error-handling code is to place all error-handling code at the end of a procedure and then, in the line immediately before the error handler, placing the Exit Sub or Exit Function statement to exit the procedure.

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For more information about the two types of procedures (Sub procedures and Function procedures), see 5, Creating Sub and Function Procedures.

System Services Specify which services the operating system should load when it starts Restricted Groups Specify the members of particular security groups Registry permissions Specify the users and groups that are permitted to access certain registry keys File System permissions Specify the users and groups that are permitted to access certain NTFS files and folders

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Alternately, you can use a more direct and simpler syntax based on the AddModelError methods:

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Once an error has been trapped, how can you tell what the error was and take corrective actions if possible VBA sets various properties of the Err object to describe the error. Two of the properties, Number and Description, provide a numerical error code and a string descrip tion, respectively, of the error. You can use the error code to recognize and correct common or expected errors. Error handlers work only for the procedure in which they appear; once the procedure has ended, the error trap is disabled. You can also disable the error handler yourself by using the following statement:

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Planning and Implementing Server Roles and Server Security (1.0)

Microsoft Office Excel 2003 Programming Inside Out If your error handler is able to fix the problem that raised the error to begin with, you will want to resume execution of your procedure. That is done by using the Resume command. Placed inside of an error handler, it resumes execution with the statement that generated the error originally. At times, the error handler might not be able to correct the problem, but if the error itself was not fatal to the execution, the error would not cause the rest of the procedure to fail. If that s the case, you can resume execution of the procedure by using the Resume Next statement. This continues execution with the statement immediately after the statement that raised the error. You can also specify execution to resume at a specific statement by using the Resume line statement. This will continue execution at the statement named by line. The following code fragment illustrates a common method of using error handlers:

As part of the secure baseline installation for your network, you have implemented the Maximum Password Age policy with a value of seven days on all your computers. This policy forces users to change their passwords every week, which lessens the chance of passwords being compromised. However, you discover that some users have taken to changing their passwords as required, and then immediately changing them back to the original password. Which of the following account policies can you use to prevent this behavior (Choose all that apply.)

public void AddModelError(string key, string errorMessage); public void AddModelError(string key, Exception exception);

A. Store Passwords Using Reversible Encryption B. Minimum Password Age C. Maximum Password Age D. Enforce Password History

On Error Goto ErrorHandler [statements] FinishedSub: Exit Sub ErrorHandler: MsgBox(str$(Err) & ": " & Err.Description, vbInformation, "Error Handler") Resume FinishedSub

You are a network administrator who has been given the task of outfitting several new employees with workstations running Windows XP Professional. Two of the new employees are responsible for evaluating new software products for their departments, and must therefore be able to install new applications on their workstations. Assuming that the workstations have the default file system permissions in place, which of the following group memberships would enable the users to install new software (Choose all that apply.)

This rather lengthy, though hopefully complete, chapter has covered all of the basic skills you need to begin creating VBA macros. You ve learned how to define and assign values to vari ables, to control the flow of your programs using loops and tests, and to handle any errors that come along. In 5, you ll learn how to create and use procedures that contain your VBA code.

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