Offline Files Database in Visual C#.NET

Painting QR in Visual C#.NET Offline Files Database

Offline files and related information are stored in a database in the system folder (systemroot\CSC) on the local computer. Note

Another term for Offline Files is client-side caching (CSC).

The CSC directory contains all offline files that are requested by any user on the computer. The database mimics the network resource while it is offline so that files are accessed as though the network resource is still available. File permissions and system permissions on the files are preserved. For example, a Microsoft Word document created by Bob, given a password, and saved to a share on which only Bob has Full Control cannot be opened from the CSC directory by Alice, because she has neither the share permissions to open the file nor the password required to open the file in Microsoft Word. You can also maintain the security of sensitive files by using Encrypting File System (EFS) to encrypt the Offline Files cache. The Offline Files folder shows the files that are stored in the database. To open or view the files directly in the CSC folder, you must log on as a member of the Administrators group.

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In a file allocation table (FAT) file system or a FAT file system converted to NTFS, users might be able to read information that is cached in the systemroot\CSC directory. This includes offline files that are requested by another user on the same computer.

It is very important not to delete files directly from the CSC directory. For information about how to delete files see Deleting Files and Folders later in this chapter.

Files are cached either automatically or manually to the computer that requests them. Automatic caching occurs when a specific file in a folder is opened, but only if the server indicates that the contents of the share must be automatically cached. Automatically cached files are marked as Temporarily Available Offline in the Offline Files folder because they can be removed from the cache as the cache fills up. There is no guarantee that an automatically cached file will be available when offline. Files are manually cached when a computer specifically requests, or pins, a particular file or folder on the network to be made available offline. You pin a file or folder by selecting the file or folder and, on the File menu, selecting Make Available Offline. Manually cached files are marked as Always available offline in the Offline Files folder. In Windows 2000 and Windows XP Professional, the Manual Caching for Documents setting is enabled by default when a folder is shared. To change the setting so that documents in the shared folder are automatically cached, right-click the folder, click Properties, click the Sharing tab, and then click Caching. In the Settings box, select Automatic Caching of Documents. You can also disable caching. Note

By default, the following file types are not cached: *.slm; *.mdb; *.ldb; *.mdw; *.mde; *.pst; *.db You can override the default settings by using the Files not cached Group Policy setting. Any file types that you specify in the Group Policy setting override the default settings. For example, if you specify that only .txt files cannot be cached, all other file types are available for caching. The default cache size for automatically cached offline files is 10 percent of the total disk space of the hard disk. You can change the default by specifying a value between 0 and 100 percent on the Offline Files tab of the Folder Options dialog box. This setting does not affect the cache for files that are manually cached by the user or for files pinned by the administrator by

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