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When using drop-down controls or any other controls with data that you know exists in your database, you don t want to populate the data by hand You want to use the databinding capabilities of a control Data binding is an easy and transparent way to read and write data and link a control on a Windows form to a data source in your application ADONET takes care of a great deal of activity behind the scenes (it s even better in NET Framework 35), as well as managing the connection to the database Managing the connection doesn t stop at opening and closing the connection; it also concerns itself with finding the database with which you re trying to connect When a connection is opened, it means your application can talk to the database through ADONET method calls ADO.

Ntldr is responsible for loading the Windows kernel (Ntoskrnl.exe) and the hardware abstraction layer (HAL) into memory. The Hal.dll file that your computer uses can vary. During installation, Windows XP Professional Setup copies one of several HAL files and renames the file Hal.dll. (See Table 29-2 for a list of HAL files.) To view the computer description in Device Manager 1. In the Run dialog box, type devmgmt.msc and then click OK. 2. In Device Manager, expand Computer to view the description of your computer. By comparing the description that Device Manager uses to the descriptions listed in Table 29-2, you can determine the HAL file that is copied to your computer from the Windows XP Professional operating system CD.

you can make Internet Explorer display Web pages in a way that is pleasing to you. Also, note that you can configure Accessibility options for Internet Explorer by clicking the Accessibility button on the General tab. This feature gives you some additional options that might make Internet Explorer easier for you to use.

29:

Table 29-2

Computer Description in Device Manager ACPI Multiprocessor PC ACPI Uniprocessor PC Advanced Configuration and Power Interface (ACPI) PC MPS Multiprocessor PC MPS Uniprocessor PC Standard PC Compaq SystemPro Multiprocessor or 100% Compatible

AutoComplete is a feature that enables Internet Explorer to remember what you have typed in Internet Explorer, such as URLs of Web pages or information like your name and address in forms on Web pages. When you start to reenter that information, Internet Explorer tries to complete it for you. If the suggested completion is correct, you can select it, and press Enter instead of typing the rest of the information. Some people find this feature useful, whereas others find it annoying. You ll have to decide what works best for you. You can adjust AutoComplete s behavior by selecting the Content tab in Internet Options and clicking the AutoComplete button to open the AutoComplete Settings dialog box shown in Figure 6-20.

Together, the kernel and the HAL initialize a group of software components that are called the Windows executive. The Windows executive processes the configuration information stored in registry control sets, and starts services and drivers. For more information about Windows executive services, see Common Stop Messages for Troubleshooting on the companion CD. Control sets Ntldr reads control set information from the HKEY_LOCAL_ MACHINE\SYSTEM registry key, which is created from information in the systemroot\System32\Config\System file, so that Ntldr can determine which device drivers need to be loaded during startup. Typically, several control sets exist, with the actual number depending on how often system configuration settings change. Caution

Do not edit the registry unless you have no alternative. The Registry Editor bypasses standard safeguards, allowing settings that can damage your system or even require you to reinstall Windows. If you must edit the registry, back it up first.

Typical registry control set subkeys are:

Select or clear the appropriate check boxes in the Use AutoComplete For section to configure AutoComplete (or clear them all if you do not want to use AutoComplete). A notable feature of AutoComplete is its ability to remember passwords. For example, you probably log on to a number of Web sites using different passwords. AutoComplete can remember your passwords and make the logon process easier. The problem, however, is that someone else using your computer can easily access those sites as well. So, depending on the sensitive nature of your Internet usage, you might consider clearing the User Names And Passwords On Forms option, and then clicking the Clear Passwords button to delete any passwords that Internet Explorer already has in memory.