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Note If you do use the XmlDataSource to display XML data from a file, make sure you use caching to reduce the number of times that the file needs to be opened with the CacheDuration, CacheDependency, and CachePolicy properties. If your file changes infrequently, you ll be able to keep it in the cache indefinitely, which guarantees good performance. On the other hand, if you need to update the underlying XML document frequently, you re likely to run into multiuser concurrency headaches, as discussed in 13.

The item is archived. Applications can use this attribute to mark files for backup or removal, although it s really just a holdover from older DOS-based operating systems. The item is compressed. Not currently used. Reserved for future use. The item is a directory. This item is encrypted. For a file, this means that all data in the file is encrypted. For a directory, this means that encryption is the default for newly created files and directories. This item is hidden and thus is not included in an ordinary directory listing. However, you can still see it in Windows Explorer. This item is normal and has no other attributes set. This attribute is valid only if used alone. This item will not be indexed by the operating system s content indexing service. This file is offline and not currently available. This item is read-only. This file contains a reparse point, which is a block of user-defined data associated with a file or a directory in an NTFS file system.

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If you re working with files, you re probably also working with file and directory paths. Path information is stored as an ordinary string, which can lead to a number of problems ranging from minor headaches to serious security breaches. For example, imagine you write the following block of code to add a filename to a path: Dim dirInfo As New DirectoryInfo("c:\temp\") Dim file As String = "test.txt" Dim strPath As String = dirInfo.FullName & "\" & file At first, this code appears to work correctly. However, a problem occurs with the last line if you try to process the root directory. Here s an example of the error: Dim dirInfo As New DirectoryInfo("c:\") Dim file As String = "test.txt" Dim strPath As String = dirInfo.FullName & "\" & file

Unlike the SqlDataSource and the ObjectDataSource, the XmlDataSource doesn t support editable binding. You can confirm this fact with a simple test just bind the XmlDataSource to GridView, and add a CommandField with edit buttons. When you try to commit the update, you ll get an error informing you that the data source doesn t support this feature. However, the XmlDataSource does provide a Save() method. This method replaces the file specified in the DataFile property with the current XML content. Although you need to add code to call the Save() method, some developers have used this technique to provide editable XML data binding. The basic technique is as follows: when the user commits a change in a control, your code retrieves the current XML content as an XmlDocument object by calling the XmlDataSource.GetXmlDocument() method. Then, your code finds the corresponding node and makes the change using the features of XmlDocument (as described earlier in this chapter). You can find and edit specific nodes, remove nodes, or add nodes. Finally, your code must call the XmlDataSource.Save() method to commit the change. Although this approach works perfectly well, it s not necessarily a great way to design a website. The XML manipulation code can become quite long, and you re likely to run into concurrency headaches if two users make different changes to the same XmlDocument at once. If you need to change XML content, it s almost always a better idea to implement the logic you need in a separate component, using the XML classes described earlier.

As you program with Visual Studio, you ll become familiar with its many timesaving conveniences. The following sections outline the most important features you ll use (none of which is new in Visual Studio 2005).

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