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In a web application, it s extremely important to pay close attention to how your code accesses the file system. If you aren t careful, a web page that reads data from a file can become a disaster under heavy user loads. The problem occurs when two users access a file at the same time. If the first user hasn t taken care to open a shareable stream, the second user will receive an error. You ll learn more about these issues in 13. However, all of this raises an excellent question how does the XmlDocument.Load() method open a file To find the answer, you need to dig into the IL code of the .NET Framework. What you ll find is that several steps actually unfold to load an XML document into an XmlDocument object. First, the path you supply is examined by an XmlUrlResolver and passed to an XmlDownloadResolver, which determines whether it needs to make a web request (if you ve supplied a URL) or can open a FileStream (if you ve supplied a path). If it can use the FileStream, it explicitly opens the FileStream with shareable reads enabled. As a result, if more than one user loads the file with the XmlDocument.Load() method at once on different threads, no conflict will occur. Of course, the best approach is to reduce contention by using caching (see 11).

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.

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Here s an example of property procedure that maintains a thread-safe global collection of metadata: Private Shared metadata As New Dictionary(Of String, String)() Public Sub AddMetadata(ByVal key As String, ByVal value As String) SyncLock metadata metadata(key) = value End SyncLock End Sub Public Function GetMetadata(ByVal key As String) As String SyncLock metadata Return metadata(key) End SyncLock End Function Using Shared member variables instead of the Application collection has two advantages First, it allows you to write custom code in a property procedure You could use this code to log how many times a value is being accessed to check whether the data is still valid or to re-create it Here s an example that uses a lazy initialization pattern and creates the global object only when it s first requested: Private Shared strFileListAs String() Public Shared ReadOnly Property FileList() As String() Get If strFileListIs Nothing Then strFileList= DirectoryGetFiles(HttpContextCurrent.

When the Page.Load event handler calls GetChildNodesDescr(), it passes an XmlNodeList object that represents the first level of nodes. (The XmlNodeList contains a collection of XmlNode objects, one for each node.) The code also passes 0 as the second argument of GetChildNodesDescr() to indicate that this is the first level of the structure. The string returned by the GetChildNodesDescr() method is then shown on the page using a Literal control.

Now that you ve taken an exhaustive look at general-purpose XML and .NET, it s worth taking a look at a related topic the XML support that s built into ADO.NET. ADO.NET supports XML through the disconnected DataSet and DataTable objects. Both have the built-in intelligence to convert their collection rows into an XML document. You might use this functionality for several reasons. For example, you might want to share data with another application on another platform. Or you might simply use the XML format to serialize to disk so you can retrieve it later. In this case, you still use the same methods, although the actual data format isn t important. Table 12-2 lists all the XML methods of the DataSet. Table 12-2. DataSet Methods for Using XML

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