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The SC is the name of the server control, and the attribute to the element is one or more of the attributes specified for the control, such as the name attribute Note the XML end tag that must be included Note also that the web server control definition is case sensitive The runat="server" attribute is mandatory; if it is forgotten, the control will not display EXAM TIP Remember the six rules of XML we looked at in 8 There must be one and only one root element, XML is case sensitive, elements must be properly nested, elements must have opening and closing tags, attributes cannot be repeated, and attribute values must be enclosed in quotes

When you design your business logic, you will find certain error conditions that will regularly arise Errors such as Not enough money to withdraw , No such customer , and so on, can be handled very nicely using the same approach that we have been discussing in this chapter Create your own exception classes, and throw the exception object when the error occurs There are a few things that you should do when you create your own exception class: Inherit from SystemException As you can see in the previous section, you may want to create your exceptions under ApplicationException Override the constructor of the base class In particular, you may want to set the error message properly The base class has been constructed as a bare-bones class you will need to override its behavior Name your class file with a descriptive error name For example, if you are creating an exception class to describe the error condition No such customer , call your exception class NoSuchCustomerFoundException You will be following the good example set by the Microsoft engineers The following class file definition illustrates a simple exception class:

Within each test section, you are permitted to return to questions you may have skipped or to change your answer If time permits, you may want to take advantage of this opportunity to review questions you were unsure of, or to check for careless mistakes However, once you have completed an entire section, you cannot go back to it and make changes

To duplicate a key for a lever-tumbler safe deposit lock, you would normally use a rotary file cutter A True B False

public class NoSuchCustomerFoundException : ApplicationException { public NoSuchCustomerFoundException (string Message) : base (@"Customer Not Found The customer you have requested cannot be found in the database Try again, please") { } }

This is a very simple example, but it does give you an idea of what you need to do to create your own exception class The next step entails throwing this exception when a customer is not found Presumably, your logic will go out to the database, search for the customer, and return with the result of the search If the customer was not found, you would code the following line:

throw new NoSuchCustomerFoundException ();

Wrenching a cylinder from a mortise deadlock will probably destroy: A The cylinder B The cylinder and damage the lock C Only the cylinder set screw D None of the above

Event handling is the area of programming that has given procedural developers the biggest problem over the years what is an event and how it is handled The first item on our agenda must be the definition of an event The examples commonly used to describe event handling are based on the concept of a cup object, and we have found that this type of example, rather than a code-based example, makes the topic easier to comprehend