how to generate barcode in asp.net c# Managing User Accounts, Passwords, and Logons in Visual C#

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Managing User Accounts, Passwords, and Logons
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Figure 7-6.
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Select Keep Files to avoid losing files in the account s My Documents folder.
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After you delete an account, of course, that user can no longer log on. Deleting an account also has other effects you should be aware of. You cannot restore access to resources that currently list the user in their access control lists simply by re-creating the account. This includes files to which the user has permission and the user s encrypted files, personal certificates, and stored passwords for Web sites and network resources. That s because those permissions are linked to the user s original SID not the user name. Even if you create a new account with the same name, password, and so on, it will have a new SID, which will not gain access to anything that was restricted to the original user account. You might encounter another predicament if you delete an account. If you use a tool other than User Accounts to delete the account, the user s original profile remains in the Documents And Settings folder. If you later create a new account with the same name, Windows creates a new profile folder, but because a folder already exists with that user s name (for example, C:\Documents And Settings\Josie), it appends the computer name to the user name to create a convoluted folder name (for example, C:\Documents And Settings\Josie.SEQUOIA). The extra folder not only consumes disk space, but leads to confusion about which is the correct profile folder. (In general, the one with the longest name is the most recent. But you can be certain only by examining files in the profile folder.) To avoid this problem, use User Accounts to delete accounts because it properly deletes the old profile along with the account.
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Part 2: Keeping Your System Secure
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Microsoft Windows XP Inside Out, Second Edition
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Inside Out
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Delete an unused profile when you delete an account If you delete an account with a tool other than User Accounts, the account s profile continues to occupy space in the Documents And Settings folder and in the registry. You don t want to delete the files or registry entries directly because a simple mistake could affect other accounts. Instead, right-click My Computer and choose Properties. Click the Advanced tab and then click Settings under User Profiles. Select the account named Account Unknown (the deleted account), and click Delete.
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Part 2: Keeping Your System Secure
7
Controlling How Users Log On
If your computer is not part of a domain, Windows XP offers two different methods for users to log on:
Welcome screen
The Welcome screen, shown in Figure 7-7, offers an easy way for users to log on. Users simply click their name and, if required, type their password. For more information, see Using the Welcome Screen, page 220.
Figure 7-7. The Welcome screen provides the simplest logon system for computers shared by only a handful of users.
Managing User Accounts, Passwords, and Logons Note Don t be misled by the fact that the word Welcome appears nowhere on the Welcome screen, yet the classic logon screen shows a Welcome To Windows dialog box. In dialog boxes and in help, references to the Welcome screen refer to the logon screen shown in Figure 7-7.
Classic logon
The alternative to the Welcome screen is the sequence of logon screens used in Windows NT and Windows 2000. When the Welcome screen is disabled (or on a domain-based computer, which doesn t support the Welcome screen), after Windows completes its startup tasks, you ll see one of the following dialog boxes: Welcome To Windows, shown in Figure 7-8, or Log On To Windows, shown in Figure 7-9.
Figure 7-8. If this dialog box appears, press Ctrl+Alt+Delete to initiate the logon process.
Figure 7-9. Ordinarily, the User Name box is filled in with the name of the last user who logged on.
Systems set up for the greatest security initially display the Welcome To Windows dialog box that invites you to log on by pressing Ctrl+Alt+Delete. When you do so, the Log On To Windows dialog box appears. Type your name and password to log on.
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