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1. Start Visual C# 2008 Express Edition by clicking Start, All Programs, Microsoft Visual C# 2008 Express Edition. Create a new Windows Forms Application project using any of the techniques shown in the previous chapters (using either the File menu or the New Project icon in the toolbar). Name the new application TestProject. 2. You should see the designer surface. If you don t, right-click the filename Form1.cs in Solution Explorer, and select View Designer. Then, using the Toolbox, drag three label controls and three text box controls to the design surface. 3. Stack the label controls vertically. A thin blue line (a snap line) appears on either the right side or the left side of the labels to help guide the alignment. When the labels are aligned correctly, release the label control.

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Log an event when a user exceeds a specified disk space warning level. The warning level specifies the point at which a user is nearing the quota limit. Prevent further use of disk space or log an event when a user exceeds a specified disk space limit.

Disk quotas are tracked on a per-user, per-volume basis; users are charged only for the files they own. Quotas are tracked per volume, even if the hard disk contains multiple volumes. If you have multiple shared folders on the same volume, the quotas apply to all shared folders equally, and a user s use of all shared folders cannot exceed the assigned quota on that volume. The disk space used by each file is charged to the user who owns the file. The file owner is identified by the security identifier (SID) in the security information for the file. The total disk space charged to a user is the sum of the length of all data streams; property set streams and resident user data streams affect the user s quota. Small files contained entirely within the file s master file table (MFT) record also affect the user s quota. Because disk quotas are based on file ownership, they are independent of the location of the files on the volume. Moving files from one folder to another on the same volume does not change volume space usage. However, copying the files to a different folder on the same volume results in duplicate files in both locations. Thus, the available volume space usage against the user s quota decreases by the number of bytes copied. Disk quotas are transparent to the user. When a user views the available disk space for the volume, the system reports only the user s available quota allowance. If the user exceeds this allowance, the system indicates that the disk is full. To obtain more disk space after exceeding the quota allowance, the user must do one of the following:

13:

option is useful for folders and files that are used for read-only access, such as applications and reference documents. By caching these types of files, the user can access them more quickly because the network doesn t need to be repeatedly accessed as the program or document is used. To set the caching options for a network share, follow these steps:

Have another user claim ownership of some files. Have the administrator increase the quota allowance.

Disk quotas are based on uncompressed file sizes. Users cannot increase the amount of free space by using NTFS compression to compress the files. For sparse files, disk quotas are based on the nominal size of the sparse file, not the actual allocated amount of disk space. For example, creating a 50-MB file with all zero bytes consumes 50 MB of that user s quota. This means the user can write data to the sparse file without exceeding the quota limit because the user has already been charged for the space. For more information about sparse files, see Sparse Files later in this chapter. To enable quotas 1. Right-click a volume in Windows Explorer or My Computer. 2. Click Properties, and then click the Quota tab. (See Figure 13-3.) 3. Do the following:

Enable or disable disk quotas. Deny disk space to users who have exceeded their quota limit. Set the default warning level and quota limit assigned to new volume users. Specify whether to log an event in the system log when a user reaches the quota or warning level.