barcode vb.net free Lesson 3 in Visual C#.NET

Generate Code 39 Extended in Visual C#.NET Lesson 3

Lesson 3
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Decoding Code 39 In Visual C#
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Troubleshooting Hardware Devices and Drivers
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Bar Code Reader In C#.NET
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Code39 Generation In .NET
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Table 10-4
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Generating Matrix 2D Barcode In C#.NET
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Device Failure Troubleshooting
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Troubleshooting Strategy Run the Hardware Update Wizard using the Update Driver button but do not let Windows Server 2003 automatically detect devices. Instead, select Install From A List Or Specific Location (Advanced) and manually point the wizard to the appropriate driver. Click the Resources tab in the device s Properties dialog box. Windows Server 2003 will enumerate other devices that are in conflict with the device. Either disable or remove the device that is in conflict. You can then enable or reinstall the device you removed. It is possible that Windows Server 2003 will allocate resources to the device automatically. Otherwise, you will have to assign resources manually.
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Error Code Friendly Text 10 The device cannot start. Try updating the device drivers for this device.
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Recognizing Bar Code In None
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This device cannot find enough free resources that it can use. If you want to use this device, you will need to disable one of the other devices on this system.
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Troubleshooting Modems and Network Cards
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Each class of device, and each individual device, might support additional properties and capabilities to facilitate configuration, optimization, and troubleshooting of the device. Modems, for example, provide a Query Modem button in the device s Diagnostics tab in Device Manager. This button sends typical commands to the modem and reports a summary on the Diagnostics tab. You can examine the verbose log of the transactions by clicking View Log. Network cards can be configured with numerous settings to control the network card s behavior. One of the most useful settings for a network card is its mode: most 10/100 network interface cards (NICs) should be set to Full Duplex for optimized performance.
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Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. You have finished configuring a new display driver and are prompted to restart the computer for the changes to take effect. Shortly after logging on, the computer
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10
Managing Hardware Devices and Drivers
screen goes blank, making working on the computer impossible. Which troubleshooting techniques or tools will allow you to recover most easily from the problem with the display driver a. Last Known Good Configuration b. Driver Rollback c. Safe mode d. Recovery Console 2. In Device Manager, a device displays an error icon. On the General tab of the device s Properties, you notice that the Device Status is Device Could Not Start. What course of action will solve the problem
3. The vendor for a wireless network card installed in your computer has released a new driver. You want to test the driver for proper functionality. Which Device Manager option will you select to test the new driver
Lesson Summary
The Last Known Good Configuration option is useful for reverting to a previously used, non-PnP driver, but only if you have not logged on to the system after restarting. Starting the computer in Safe mode loads a minimal set of drivers, allowing for access to Device Manager to disable, uninstall, or roll back a driver that is prohibiting the system from functioning properly. Most driver problems occur during manual configuration of an inappropriate driver. Resource settings should be adjusted manually only when the operating system cannot resolve conflicting settings. All manually configured resource allocations must be unique.
10
Managing Hardware Devices and Drivers
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Case Scenario Exercise
Hardware profiles also allow for the optimization of performance and power usage. Each hardware profile determines which devices and services are used when the system is started using that profile. A laptop computer, for example, can have its battery life extended by creating a mobile profile, which disables devices that are not needed when the computer is disconnected from the network. Hardware profiles also provide a powerful troubleshooting option. If a computer is experiencing system resource allocation conflicts, it can be challenging to determine the appropriate resources to allocate manually. Rather than experimenting with the standard configuration of the system, create a copy of the configuration in a new hardware profile and use the new profile to troubleshoot the conflict. When you have identified the correct resource allocation, you can apply the solution to the standard hardware profile. In this exercise, you will create a hardware profile and disable the network card in that profile. 1. On the Hardware tab of System Properties, click Hardware Profiles. 2. Copy the current profile to a new profile. Name the profile Mobile and leave the Hardware Profiles Selection setting at the default (selects the first profile in the list if a selection is not made within 30 seconds). 3. Restart the computer. When prompted to select a hardware profile, choose Mobile. 4. Log on and open Device Manager from the Hardware tab in System Properties. 5. Right-click the network card shown in Device Manager and choose Properties. 6. In the Device Usage drop-down list on the Properties page for the network card, select Do Not Use This Device In The Current Hardware Profile (disable). You have now disabled the network card for use in a single profile. You can use this technique in many situations, including troubleshooting devices, by creating Hardware profiles that enable or disable different devices whose combined interactions and resource usage you are testing.
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