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much data is provided by an application, at least the format in which Vista presents it to you is consistent An example of an event s properties is shown in Figure 14-17 Table 14-4 lists the common event properties For more information about event properties and the underlying XML schema, see the Event Representation for Event Consumers topic in the Windows Event Log Software Development Kit (SDK), found at: msdn2 microsoftcom/en-us/library/aa385780aspx Note some other features of the Event Properties window By clicking the Copy button, you copy the XML for the event to the Clipboard, and can paste it into any text editor You can view the Details tab, which allows you to see the raw payload of the event in either a user-friendly view or in XML You can also resize the Event Properties window itself to get a better view

16-bit (287) Advanced Configuration and Power Interface (ACPI) (299) Advanced Power Management (APM) (299) aspect ratio (277) auto-switching power supply (303) battery memory (296) beaming (281) card services (288) CardBus (287) conditioning charger (296) desktop extender (279) desktop replacement (279)

docking station (291) ExpressCard (287) fuel cell (297) hibernation (299) high gloss (278) HotSync (281) laptop (278) Lithium-Ion (Li-Ion) (296) matte (278) Mini PCI (295) Nickel-Cadmium (Ni-Cd) (296) Nickel-Metal Hydride (Ni-MH) (296) PC Card (287)

Custom views are stored filters that you create to suit a specific need After creating and saving a custom view, you can reuse it anytime you wish To reuse a custom view, navigate to the Custom Views node in the console tree, and select the name of the custom view By selecting the custom view, you launch the filter automatically, and the results are displayed in the center pane of the Event Viewer Note that you can export a custom view by right-clicking it and choosing Export A Custom View Likewise, you can import a custom view by selecting the Custom View node, right-clicking it, and choosing Import A Custom View To create a custom view using the Vista interface:

one of the debugging windows to see the value Observe that LastName is null This is the critical point in the analysis, finding the value that is null It was clear that cust is not null because the previous statement, cleaning FirstName, executed without error as verified by inspecting the firstName variable This example makes it very easy to find the null value because it occurred on the line where VS paused In more challenging situations, you could be passing an object to a method in a third-party library where you don t have the code and VS will pause on the line with the method call In that case, you have to inspect the values being passed to the method to see if any are null Once you ve found the null value, you must understand why the code raised the NullReferenceException error A null value is the absence of a value; nothing is assigned to the variable If you try to reference a variable with null assigned to it, you will receive a NullReferenceException This makes sense because you are trying to perform an operation on a variable that has no definition In this particular example, LastName is null, but we re still referencing LastName by calling the Trim method This is illogical because there is not a string to trim; the string variable is set to null

pen-based computing (280) personal digital assistant (PDA) (280) port replicator (290) shared memory (293) smart battery (297) socket services (288) stylus (280) System Management Mode (SMM) (299) tablet PC (282) touchpad (279) TrackPoint (279)

14:

You want the NullReferenceException to be raised because it protects you from performing an invalid operation in your code After you ve found the null value and ascertained the reason, it s time to find out why the value is null in order to make an informed decision on a fix

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