c# calculate upc check digit Setting Up and Troubleshooting Hardware in Visual C#.NET

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Virtually all modems use generic drivers supplied with Windows Vista. For specific hardware brands, installing a driver typically adds values to the registry that enable custom commands, such as those issued through AT commands. To adjust modem settings, open the properties dialog box for the device and look at the Advanced tab. Figure 5-12 shows the interface for adding custom AT commands.
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Figure 5-12 Use this dialog box to add custom AT commands to a modem.
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The lines are increasingly becoming blurred between SmartPhones, handheld computers, and music players. A SmartPhone with a Secure Digital memory card, for instance, can synchronize files with Windows Explorer, music with Windows Media Player, and contact information with Microsoft Office Outlook. The drivers installed by default may only enable some of this functionality, so be sure to check for custom drivers that unlock all features. To enable SmartPhone functionality, visit Windows Update and install the Windows Mobile Device Center software.
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Windows XP included hundreds of drivers for legacy devices that don t support Plug and Play; the Windows Vista driver store includes a much smaller collection, mostly for older printers, modems, scanners, infrared ports, PCMCIA controllers, and other oddball devices that don t use Plug and Play connections. As you might suspect, Windows will not automatically set up such devices, and you re rolling the dice if you find one of these old but still worthwhile devices and try to install an old driver. But what
Installing and Configuring a New Device
if the device in question is valuable to you and can t be easily replaced by a newer, supported one Then by all means give it a try. Download the most recent hardware drivers you can find (ideally for Windows XP or Windows Server 2003), and then use the Add Hardware Wizard to complete the hardware setup process. Follow these steps: 1. If you ve found a downloadable driver package or a CD that came with the device, look for a Setup program and run it. This option places the driver files on your hard disk and simplifies later installation steps. 2. Connect the new hardware to your computer. In the case of an internal device such as an add-in card, turn off the computer, add the device, and then restart. 3. Open Device Manager, select any item in the list of installed devices, and then click Add Legacy Hardware on the Action menu. 4. Click Next to skip past the Welcome screen. On the next wizard screen, choose how you want to select the device to be installed.
For printers, network cards, modems, and other devices that can be detected mechanically, choose Search For And Install The Hardware Automatically (Recommended). After you click Next, the wizard quickly runs a detection module that searches for anything on its list of non Plug and Play devices. If it finds the new device, it installs the driver automatically, and your work is finished. If the wizard doesn t find any new hardware, you ll be prompted to click Next and look manually. If you have a driver on a disk, skip the detection process. Choose Install The Hardware That I Manually Select From A List (Advanced) and click Next.
5. From the Common Hardware Types list, select a hardware category (or the inclusive Show All Devices category) and click Next.
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5 Setting Up and Troubleshooting Hardware
6. From the master list of available drivers, select the device manufacturer and the correct model. Click Next to continue. Follow the prompts to complete the wizard.
Changing Settings for an Installed Device
By default, Device Manager displays information about all currently installed and connected Plug and Play devices. To view devices that use non Plug and Play drivers, as well as previously installed devices that are not currently connected, you need to tweak Device Manager slightly.
To view non Plug and Play devices, open Device Manager and choose Show Hidden Devices from the View menu. In the default Devices By Type view, the formerly hidden devices appear under the Non Plug And Play Drivers branch. To view devices that were once installed but are no longer attached to the computer, open a Command Prompt window using the Run As Administrator option and enter the command SET DEVMGR_SHOW_NONPRESENT_DEVICES=1. Then, from the same command prompt, type devmgmt.msc to open Device Manager. Choose View, Show Hidden Devices. The new instance of Device Manager now shows ghosted entries for devices that were once present. This technique is especially useful for fixing problems caused by leftover drivers after replacing a network card or video card just delete the ghosted device. To see advanced details about a device, open the properties dialog box for the device and look on the Details tab. The value shown under Device Instance Id is especially useful for tracking down devices that are detected incorrectly. The full details for a device ID shown here can be found in the registry, under HKLM \System\CurrentControlSet\Enum. Although we don t recommend idly deleting the found key, this information might provide enough information to figure out why a device isn t being identified properly.
Setting the DEVMGR environment variable described in this section affects only the instance of Device Manager launched from that Command Prompt window. If you want the change to be persistent, open Control Panel, open System, click Advanced System Settings, click Environment Variables on the Advanced tab, and define a new variable for this setting. If you add the variable to the User Variables section, the setting applies only to the current user; if you edit the System Variables section, the extra information is visible in Device Manager for all users of the current computer.
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