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using System; public class UserInputTest { public static void Main () { try { int x; ConsoleWrite ("Enter an integer between 12 and 42 : "); x = Int32Parse (ConsoleReadLine()); if (x > 42) throw new GreaterThan42Exception(); //home-grown exception else if (x < 12) throw new LessThan12Exception(); // home-grown exception } catch (GreaterThan42Exception g) { ConsoleWriteLine ("You entered a value greater than 42"); } catch (LessThan12Exception l) { ConsoleWriteLine ("You entered a value less than 12"); } catch (Exception e) { ConsoleWriteLine (eMessage);

Note: The following exam includes sample questions from the General Locksmith Certification Exam required for the following designations: Registered Locksmith (RL), Certified Registered Locksmith (CRL), Certified Professional Locksmith (CPL), Certified Master Locksmith (CML), Certified Professional Safe Tech (CPST), and Certified Master Safe Tech (CMST) In addition to the General Locksmith Certification Exam, elective exams are required

} } class GreaterThan42Exception : Exception { // put some specific code here } class LessThan12Exception : Exception { // put some specific code here } }

The highlighted lines will cause the exceptions GreaterThan42Exception() or LessThan12Exception() to be thrown, and then execution control moves to the catch blocks where the exception can be handled Remember the goal of this type of coding you have separated the exception-handling logic from the business logic of the program, thereby accomplishing the decoupling goal of OOP

The folks that brought you the NET languages have anticipated a number of common exceptions and provided prebuilt classes for you to use in your programs These exist in the Base Class Library (or, as it is also known, the NET Framework Class Library) We will briefly look at the SystemException class; for more information on the BCL and exceptions see Appendix D EXAM TIP All exceptions inherit from SystemException If you want to catch all the exceptions from a try block, catch SystemException

Key code A*51 in a code book marked with a note of 450=DB is: A A direct digit B A derivative or conversion C The same code listed as DB-A451 D None of the above

SystemException The SystemException class is the parent class of all exceptions All other exceptions, whether they are prebuilt or home-grown (your own exception classes), should derive from SystemException It s a good idea to become familiar with the properties and methods of this class, since any classes built will inherit these properties and methods Here are some of the properties: Message retrieves a message that describes the exception Source gets or sets the name of the object that caused the exception StackTrace allows you to display the call stack at the time of the exception This way you can chase back through the method calls to determine the sequence of execution TargetSite retrieves the methods that threw the exception InnerException gets the Exception instance that caused the current exception The best way to become familiar with these properties and to explore the methods that are either inherited by SystemObject or are new to SystemException and thereby are inherited by all other exceptions is to review the NET Framework Class Library documentation

Table 12-1

How are codes listed in code books A From bow to tip B From tip to bow C It depends on the code book D It depends on the country of origin

Some of the HTML Controls in the Visual Studio NET Toolbox (continued)

To add any control from the Toolbox to a Web Form, you can use either of two techniques: Double-click the control to get a default-sized control on the form Select the control and draw the control on the form

Let s continue working with the WebApplication1 form you created in a previous section add two text fields and a button as shown in Figure 12-4 The HTML definition of the controls can be viewed in the HTML editor for the Web Form, as shown in Figure 12-5

Although automotive keys are often punched out on code clippers, many other keys like Schlage, Best, and Arrow cannot be punched accurately A True B False

Figure 12-4