create barcode image in vb.net 4: Network Resources in C#.NET

Creator PDF-417 2d barcode in C#.NET 4: Network Resources

4: Network Resources
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note Enabling compression on a server that is accessed regularly is not a good idea. Every file
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read and written to the compressed folder or volume will have to be decompressed and recompressed, and (if there are lots of users) this can consume a considerable amount of CPU cycles and memory. If a server is being used to archive files, compression is often appropriate. Another good candidate for compression is the end-user workstation. With NTFS file compression, you can choose to compress folders containing infrequently accessed and highly compressible content, and still leave frequently accessed application and system folders uncompressed.
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File Encryption
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In its latest version, NTFS also makes use of robust encryption technology. The Encrypting File System (EFS) uses a public-private key pair and a per-file encryption key to protect resources on an NTFS volume. The use of encryption ensures that only the proper individuals and recovery systems can access the protected data. When an authorized user accesses an encrypted file, the system decrypts the file. The user can then work with the file. When the user saves the modified file back to the hard disk, the system encrypts the file again. This whole process is entirely transparent to a user
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13: Selecting a File System
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who has the proper credentials to access the file. Any unauthorized user attempting to access the file will receive an Access Denied error message; however, unlike with NTFS file permissions, where simply being granted permission to the file will allow a user to open it, encrypted files are completely inaccessible to even users with sufficient file system rights. This allows extremely confidential data to be secured against access by individuals who have file system permissions (such as administrators) but who should not be granted the ability to view that data. Encryption also prevents individuals who manage to bypass NTFS security altogether from viewing the confidential data. Keep in mind, however, that EFS is not available with Windows XP Home Edition.
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note You cannot simultaneously encrypt and compress a folder or a volume. Folders and
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volumes in Windows XP Professional can be compressed or encrypted, but not both.
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File and Folder Access Control List
NTFS offers the capability to configure security settings on files and folders. The security settings are stored in what is known as the access control list (ACL). Every file on an NTFS volume has an ACL component. The ACL is not supported by any of the FAT file systems, and if any file with an ACL is relocated to a FAT volume, the ACL will be dropped. Most of the ACL security features are not routinely available in Windows XP Home Edition.
For a full description of security in Windows XP including ACLs and file sharing security, see 14, Understanding Resource Sharing and NTFS Security.
Indexing Service
Simply put, Indexing Service creates and maintains an index of your files and filerelated information, and enables you to search the index to quickly locate and retrieve the data you need. In the same way a book has an index revealing the location of various components, Indexing Service has information about the contents and location of certain types of files stored on your computer. The information collected by Indexing Service is used by the Windows XP Search feature, a Web browser, or a direct query of Indexing Service to locate files matching the description you provide. The individual indexes Indexing Service creates can be used in a variety of ways. For example, a Web site can be indexed (enable Indexing Service in IIS), allowing Web site clients to use the generated index to search the Web site. Indexing Service indexes a wide variety of file attributes. You can query Indexing Service based on any of these tracked parameters, such as finding all files created after a certain date that contain the text Microsoft Windows XP. Indexing Service also enables broad searches, such as finding all of the
4: Network Resources
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Part 4: Network Resources
Microsoft Word documents on a hard disk. Although Indexing Service supports FAT file system disks, NTFS is its file system of choice because Indexing Service was specifically designed to offer robust interoperability with NTFS. The result is that Indexing Service takes advantage of the many file system features of NTFS to yield maximum performance. One of the most critical advantages of using Indexing Service with NTFS volumes is its awareness of the security settings of files. The Indexing Service catalog tracks file-level permissions settings along with the other file information in its catalog. The net result is that if a user does not have access to a file, that file will not appear when the user searches for the file. In addition to respecting the file permissions, Indexing Service takes special care when dealing with encrypted files. Indexing Service does not index information about encrypted files because the information itself would not be encrypted. In fact, if Indexing Service discovers that one of the files included in its index has become an encrypted file, Indexing Service will flush the file from its catalog.
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