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Additionally, you can drill down into the customers collection in one of the debugging windows, such as Autos, Locals, or Watch, inspecting the Customer object at index 1 If you recall from Step 3 in the preceding sequence, the Customer object we re interested in is at index 1 This result tells us that LastName for this Customer was set to null at the data source and there is nothing we can do to keep it from being set to null; another case of bad data If you see a trend, you would be correct; never trust data whether it comes from a user on the front end or from the database on the back end At this point, we have all the information we need to fix the problem and make sure we don t accidentally call methods on null data Press SHIFT-F5 to stop debugging

A local company just donated ten laptops to your school library They are IBM ThinkPad 600x PIII 500-Mhz laptops with 128 MB of RAM and two Type II PC slots The school would like to let distance education students check out these computers, but the laptops do not have modems Your hardware class has been asked to select PC Card modems for these laptops What features will you look for in selecting the right modem Either go to the local computer store or search the Internet to find the modem cards you will recommend

15 Select the folder in which you want to store the custom view Custom views can be stored in the Custom Views folder or in any subfolder of the Custom Views folder You create new subfolders in the Custom Views folder by clicking the New Folder button 16 You can make the custom view accessible to either anyone using the computer or only to someone logged on to your current user account: To save the custom view and make it accessible to anyone using the computer, ensure that the All Users check box is selected, and click OK To save the custom view and make it accessible only to someone logged on to your current account, ensure that the All Users check box is not selected, and click OK

Describe current printer technologies Explain the laser printing process Install a printer on a Windows PC Recognize and fix basic printer problems

then replacing null with a default value Comment out the contents of the foreach loop and replace it with the following code: C#:

You can also modify a custom view by editing the XML query directly Before you save the custom view, click the XML tab at the top of the Create Custom View dialog box, click the Edit Query Manually check box, and then click OK in response to the warning dialog box This is shown in Figure 14-21

espite all of the talk about the "paperless office," printers continue to be a vital part of the typical office In many cases, PCs are used exclusively for

string firstName = stringEmpty; if (custFirstName != null) { firstName = custFirstNameTrim(); } string lastName = custLastName == null "" : custLastNameTrim(); if (searchName == firstName) { ConsoleWriteLine( "Found: {0} {1}", firstName, lastName); customerFound = true; }

You can configure a task to run when a specific event occurs You have to provide the event definition and assign the text using the Event Viewer interface The task object is a new Task Scheduler job that gets posted to the Event Viewer folder in the Task Scheduler Library The task is run on demand as the event you wish to track is posted to the Vista event logs To run a task in response to an event:

the purpose of producing paper documents Many people simply prefer dealing with a hard copy Programmers cater to this preference by using metaphors such as page, workbook, and binder in their applications The CompTIA A+ certification exams strongly stress the area of printing and expect a high degree of technical knowledge of the function, components, maintenance, and repair of all types of printers

No other piece of your computer system is available in a wider range of styles, configurations, and feature sets than a printer, or at such a wide price variation What a printer can and can t do is largely determined by the type of printer technology it uses that is, how it gets the image onto the paper Modern printers can be categorized into several broad types: impact, inkjet, dye-sublimation, thermal, laser, and solid ink

14:

Dim firstName As String = StringEmpty If (custFirstName IsNot Nothing) Then firstName = custFirstNameTrim() End If Dim lastName As String

You may notice overlap from the Essentials course, as all of the CompTIA A+ exams expect you to be able to describe printer technologies You need to know this stuff to pass any of the CompTIA+ exams! The