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hours properties and a calculate pay method Each person s weekly time sheet is then an object from the time sheet class A speci c object created from a class is called an instance of the class Each instance can have values for the de ned set of properties and can perform the de ned methods So Sam is an instance of the employee class, and Jessica s time sheet for last week is an instance of the time sheet class The set of properties and methods described by a class are often called class members A class de nes the members, including the actual code to maintain the property values and perform the methods Each object that is an instance of that class can execute the methods and retain values for each property Figure 12 shows a time sheet class and two time sheet objects created from the time sheet class: Jessica Jones s time sheet and Sam Smith s time sheet, both from May 15 A class itself normally does not maintain state, meaning that it normally does not have any property values Nor does it normally execute the class methods Instead, the class de nes the properties and contains the implementation of the methods that are used by each object created from the class Each object has values for the properties and performs the methods You do not eat the cookie cutter or ll out a time sheet class You eat each cookie and ll out each individual time sheet The NET Framework itself is composed of a set of classes For example, the button in the Visual Studio Toolbox represents a Button class Each time you add a button to a form, you create an instance of that Button class The Button class has speci c de ned methods, such as Focus, and properties, such as Name and Text The Button class itself does not have a value for the Name or Text properties Nor can it have focus Instead, it contains the implementation of the Name and Text properties and the Focus method The Button objects that you create as instances of that Button class have values for the Name and Text properties and perform the Focus method In Visual Basic, any code you write resides in a class If you type some code in a form, your code is in the form s class Even if you write code in a module, the code compiles as a class! If you have never created a class, the following example may help you visualize the code for a TimeSheet class:.

QuickBooks. Many copy shops offer scanning services, as do most professional artists who create logos. After you have the logo as an electronic le, save it in the QuickBooks folder on your hard disk. QuickBooks accepts graphics only in the bitmap (.bmp) format. If your graphic is in any other format, you will have to convert it. There are many graphics programs that enable you to open a le in one format and save it in another. Paint Shop Pro, which is shareware, works well. To include your logo on a form, follow these steps: 1. Go to Lists Templates. A list of existing templates appears. 2. Double-click the template to which you want to add a logo (or click the Templates menu button and select Edit). A Customize Invoice dialog box appears as shown in Figure 15-14.

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Canon Speedlites 580EX II 430EX II and 430EX Exposing with Speedlites Exposure considerations with a Speedlite E-TTL II FEL Manual exposure Add-On Modi ers for Speedlites Gary Fong Lightsphere Big Bounce Sto-Fen modi er Portable ring lights O -camera setups Using Speedlites in Various Lighting Situations Daylight Low light Dim interiors and exteriors Remote Triggering with Speedlites

2 Examine the NET Framework exceptions to determine which exception makes sense in that situation 3 Throw the exception using the Throw statement For example, instead of displaying a message box when there is no active MDI child form, add code that throws an exception:

If frmToPrint Is Nothing Then eCancel = True Throw New InvalidOperationException( _ MyResourcesPrintErrActiveForm) End If

Select to add a logo to an existing template Figure 15-14: This Customize dialog box contains limited options for modifying an existing template.

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The If no longer needs an Else statement Throwing an exception can simplify your method s structure because when the exception is thrown, processing immediately ows to the calling code (after executing any Finally clause, as described in the next section) If there is no error, ow continues in the method The message text de ned for the exception can be any descriptive text, since it is not displayed to the user However, you can still put these text strings in the resource le, as described in the preceding section Be sure to make the message text descriptive, because it can help you debug the code if a problem occurs Here are some of the most common NET Framework exceptions you can throw:

3. Open the template for customization, as you learned earlier, and click the Customize button to access the Company tab in the Customize dialog box. 4. Click the Use Logo checkbox. The Select Image dialog box appears.

ArgumentException speci es a general error with one of the ArgumentNullException speci es that one of the parameters passed into the method is null (Nothing) ArgumentOutOfRangeException speci es that one of the param-

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