c# calculate upc check digit Updating a Device Driver in Visual C#.NET

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Updating a Device Driver
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Microsoft and third-party device manufacturers frequently issue upgrades to device drivers. In some cases, the updates enable new features; in other cases, the newer version swats a bug that might or might not affect you. New WHQL-signed drivers are sometimes (but not always) delivered through Windows Update. Other drivers are only available by downloading them from the device manufacturer s website. If the new driver includes a setup program, run it first, so that the proper files are copied to your system. Then start the update process from Device Manager by selecting the entry for the device you want to upgrade and clicking the Update Driver button on the toolbar or the Update Driver option on the right-click shortcut menu. (You can also click Update Driver on the Driver tab of the properties dialog box for the device.) Click Search Automatically For Updated Driver Software if you want to look in local removable media and check Windows Update. Click Browse My Computer For Driver Software if you want to enter the location of a downloaded driver package or choose from a list of available drivers in the driver store.
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How do you know whether a downloaded version is newer than the currently installed driver on your system A good Readme file should provide this information and is the preferred option for determining version information. In the absence of documentation, file dates offer some clues, but they are not always reliable. A better indicator is to inspect the properties of the driver files themselves. After unzipping the downloaded driver files to a folder on a local or network drive, right-click any file with a .dll or .sys extension and choose Properties. On the Version tab, you should be able to find details about the specific driver version, which you can compare to the driver details shown in Device Manager.
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Make sure that update is really an update
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Rolling Back to a Previous Driver Version
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Unfortunately, updated drivers can sometimes cause new problems that are worse than the woes they were intended to fi x. This is especially true if you re experimenting with unsigned drivers or beta versions of new drivers. If your troubleshooting leads you to suspect that a newly installed driver is the cause of recent crashes or system instability, consider removing that driver and rolling your system configuration back to the previously installed driver. In Windows Vista, this process is essentially the same as in Windows XP. Open Device Manager and double-click the entry for the device you want to roll back. Then go to the Driver tab and click Roll Back Driver. The procedure that follows is straightforward and self-explanatory.
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Uninstalling a Driver
There are at least three circumstances under which you might want to completely remove a device driver from your system:
You re no longer using the device, and you want to prevent the previously installed drivers from loading or using any resources. You ve determined that the drivers available for the device are not stable enough to use on your system. The currently installed driver is not working correctly, and you want to reinstall it from scratch.
To remove a driver permanently, open Device Manager and double-click the entry for the device in question. On the Driver tab, click Uninstall. Click OK when prompted to confirm that you want to remove the driver, and Windows removes files and registry settings completely.
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Manage Plug and Play drivers
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Removing and reinstalling the driver for a Plug and Play device requires a little extra effort. Because these drivers are loaded and unloaded dynamically, you can remove the driver only if the device in question is plugged in. Use the Uninstall button to remove the driver before unplugging the device. To reinstall the device driver without unplugging, open Device Manager and choose Action, Scan For Hardware Changes.
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