generate barcode using vb.net Using System Protection to Save the Registry s State in Visual C#

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Using System Protection to Save the Registry s State
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The System Protection utility takes snapshots of your system s state, at prescribed time intervals or on demand, and allows you to roll your system back to an earlier state (called a restore point) if you experience problems. Most of the registry is included in the restore point (the keys that are not included are listed at HKLM\System\ControlSet001\ BackupRestore\KeysNotToRestore). Creating a restore point before you begin working in the registry is an excellent way to protect yourself against mishap.
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For information about using System Restore, see Rolling Back to a Stable State with System Restore, in 23 .
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Editing the Registry
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Browsing and Editing with Registry Editor
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Because of the registry s size, looking for a particular key, value, or data item can be daunting. In Registry Editor, the Find command (on the Edit menu; also available by pressing Ctrl+F) works in the forward direction only and does not wrap around when it gets to the end of the registry. If you re not sure where the item you need is located, select the highest level in the left pane (Computer, if you re searching your own registry) before issuing the command. If you have an approximate idea where the item you want is located, you can save time by starting at a node closer to (but still above) the target.
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INSIDE OUT
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Search and replace faster with third-party tools
To put the matter kindly, the Find command in Registry Editor does not set any speed records (no positive records, at any rate) . Nor does it perform the kind of search-andreplace operations that are commonplace in text editors . Given the fact that registry changes take effect immediately, the absence of search-and-replace can be seen as a safety feature . If you don t take the precaution of backing up your registry before editing, you risk the possibility of carelessly replacing all instances of one string with another . If you take reasonable precautions, however, and if you need to edit your registry more than now and then, you might want to consider using a third-party product to enhance the native capabilities of Registry Editor . Reasonable precautions here means backing up and avoiding unprompted search-and-replace . If you re going to replace all instances of one string with another, let the registry tool prompt you before making each replacement . At the time of this book s writing, third-party registry tools for Windows Vista were still in development, and none that we could recommend were available . By the time you read this, tools that are better and faster than Registry Editor will undoubtedly be available; if you work in the registry often, don t feel locked in to Registry Editor .
After you have located an item of interest, you can put it on the Favorites list to simplify a return visit. Open the Favorites menu, click Add To Favorites, and supply a friendly name (or accept the default). If you re about to close Registry Editor and know you ll be returning to the same key the next time you open the editor, you can skip the Favorites step, because Registry Editor always remembers your last position and returns to that position in the next session.
Browsing and Editing with Registry Editor
INSIDE OUT
Forget the last position!
Registry Editor remembers your last position by saving it in the LastKey value in the HKCU\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit key when you close the program . For some, the ability of Registry Editor to return to the last-viewed key at startup is a convenient way to pick up where they left off; for others, it s an annoyance . If you re in the latter camp, you can override this behavior by removing Full Control permissions on the HKCU\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit key . Doing so prevents further changes to the LastKey value . (Before you set permissions this way, you should delete the data in LastKey, or else you ll always return to that same spot!) This approach is effective, but has some potentially undesirable side effects: Registry Editor no longer saves View or Find settings, nor can you save Favorites in Registry Editor . (You can overcome the last problem by breaking the permissions inheritance chain on the Favorites subkey .) There s another way to start Registry Editor at the root, without the side effects . Create a simple batch program that clears the LastKey data and then opens Registry Editor, like this:
@echo off setlocal set key=HKEY_CURRENT_USER\Software set key=%key%\Microsoft\Windows\CurrentVersion\Applets\Regedit reg.exe add %key% /v LastKey /d "" /f start regedit
Registry Editor includes a number of time-saving keyboard shortcuts for navigating the registry. To move to the next subkey that starts with a particular letter, simply type that letter when the focus is in the left pane; in the right pane, use the same trick to jump to the next value that begins with that letter. To open a key (revealing its subkeys), press Right Arrow. To move up one level in the subkey hierarchy, press Left Arrow; a second press collapses the subkeys of the current key. To move to the top of the hierarchy (Computer), press Home. To quickly move between the left and right panes, use the Tab key. In the right pane, press F2 to rename a value, and press Enter to open that value and edit its data. Once you get the hang of using these keyboard shortcuts, you ll find it s usually easier to zip through the subkey hierarchy with a combination of arrow keys and letter keys than it is to open outline controls with the mouse.
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