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This code fixes the problem two different ways, giving you more than one way to solve the problem, depending on the style you prefer In essence, the solution checks the FirstName and LastName properties to see if they are null (Nothing in VB) If they are not null, we know the properties have valid strings and are safe to work with Otherwise, we return an empty string In VB, you use the Is and IsNot operators when working with Nothing, rather than the respective == and != for working with C# null Also, the VB Iif, which is the equivalent of the C# ternary operator, evaluates both true and false expressions, resulting in a NullReferenceException even if the false condition doesn t execute Therefore, the preceding VB example uses the more verbose If Then Else syntax The choice to default to an empty string is specific to this example only In practice, you ll have to look at your own situation to see if it makes sense to use a default value For example, the presence of a null value might represent an erroneous condition and you might prefer to log the condition and not allow the user to continue with the current operation Another strategy might be to skip this record, processing all the others, and then show the user a list of records that weren t processed You might want to fix the problem with any or none of the ideas I have here, but my point is that you should think about what working with a null value means to your particular situation and not think that the only way to fix a null reference bug is the way we did here

An Epson FX-880+ dot-matrix printer (photo courtesy of Epson America, Inc)

14:

Inkjet printers (also called inkdispersion printers) like the one in Figure 153 are relatively simple devices consisting of a printhead mechanism, support electronics, a transfer mechanism to move the printhead back and forth, and a paper feed component to drag, move, and eject paper (Figure 154) They work by ejecting ink through tiny tubes Most inkjet printers use heat to move the ink, while a few use a mechanical method The heat- method printers use tiny resistors or electroconductive plates at the end of each tube (Figure 155), which literally boil the ink; this creates a tiny air bubble that ejects a droplet of ink onto the paper, thus creating portions of the image The ink is stored in special small containers called ink cartridges Older inkjet printers had two cartridges: one for black ink and another for colored ink The color cartridge had separate compartments for cyan (blue), magenta (red), and yellow ink, to print colors using a method known as CMYK (you ll read more about CMYK later in this chapter) If your color cartridge ran out of one of the colors, you had to purchase a whole new color cartridge or deal with a messy refill kit Printer manufacturers began to separate the ink colors into three separate cartridges, so that printers

8 Press F5 to run the program It will provide the following output:

d Fill in the name and path to any attachments you wish to send e Be sure to provide the Internet Protocol (IP) address or name of the Simple Mail Transfer Protocol (SMTP) server that will accept a request from your computer to send an e-mail f Click the Next button Figure 14-23 shows the dialog box seeking this information 7 If you wish to modify the new task upon completing it, click the Open The Properties Dialog When I Click Finish check box, and then click the Finish button Note these restrictions on associating tasks with events: You cannot assign a task to an event in a saved log You cannot assign a task to an event in an analytic or debug log

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

came with four cartridges: one for each color and a fourth for black (Figure 156) This not only was more cost-effective for the user, but it also resulted in higher quality printouts Today you can find color inkjet printers with six, eight, or more color cartridges In addition to the basic CMYK inks, the other cartridges provide for green, blue, gray, light cyan, dark cyan, and more Typically, the more ink cartridges a printer uses, the higher the quality of the printed image and the higher the cost of the printer The two key features of an inkjet printer are the print resolution that is, the density of ink, which affects print quality and the print speed Resolution is measured in dots per inch (dpi) ; higher numbers mean that the ink dots on the page are closer together, so your printed documents will look better Figure 156 Inkjet ink cartridges Resolution is most important when you re printing complex images such as full-color photos, or when you re printing for duplication and you care that your printouts look good Print speed is measured in pages per minute (ppm) , and this specification is normally indicated right on the printer s box Most printers have one

Upon completing the task, you view or edit it through the Vista Task Scheduler by following these steps: 1 Launch the Task Scheduler by clicking the Start button, typing Task Scheduler into the Search field, and pressing the ENTER key 2 In the left pane, locate the Event Viewer folder, and open it by double-clicking it