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This approach is ideal for storing simple blocks of data. For example, you could modify the guest book page in the previous chapter to store guest book entries in an XML format, which would provide greater standardization but wouldn t change how the application works. Your code for serializing and deserializing the XML data would change, but the rest of the application would remain untouched. The XDocument class provides a different approach to XML data. It provides an in-memory model of an entire XML document. You can then browse through the entire document, reading, inserting, or removing nodes at any location. (You can find the XDocument and all related classes in the System.Xml.Linq namespace.) When using this approach, you begin by loading XML content from a file (or some other source) into an XDocument object. The XDocument holds the entire document at once, so it isn t a practical approach if your XML content is several megabytes in size. (If you have a huge XML document, the XmlTextReader and XmlTextWriter classes offer the best approach.) However, the XDocument really excels with the editing capabilities that it gives you. Using the XDocument object, you can manipulate the content or structure of any part of the XML document. When you re finished, you can save the content back to a file. Unlike the XmlTextReader and XmlTextWriter, the XDocument class doesn t maintain a direct connection to the file.

Dim dirInfo As New DirectoryInfo(dir) lstFilesDataSource = dirInfoGetFiles() lstFilesDataMember = "Name" lstFilesDataBind() Just remember that when you bind a collection of objects, you need to specify which property will be used for the list In this case, it s the DirectoryInfoName or FileInfoName property..

Note The XDocument is .NET s most modern tool for in-memory XML manipulation. It was introduced as part

Using metadata in this way is especially useful in generating documentation automatically. One method of creating manuals from metadata is to use the PHPDoc standard. If you create doccomments that follow a specific format, a parser program can turn the comments into meaningful documentation automatically.

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The .NET Framework makes it easy to create simple flat files in text or binary format. Unlike a database, these files don t have any internal structure (that s why they re called flat). Instead, these files are really just a list of whatever information you want to store.

of LINQ (a feature you ll learn about in 24), in .NET 3.5. Before this, .NET developers used a similar but slightly more awkward class called XmlDocument. This distinction is important, because the XmlDocument is still kicking around in .NET 4 and there are a few old classes and methods that expect it, instead of the XDocument. However, because the XDocument is more powerful and more convenient, Microsoft recommends that you make it your go-to tool for serious XML work.

You can write to a file and read from a file using a StreamWriter and a StreamReader dedicated classes that abstract away the process of file interaction. There really isn t much to it. You can

When you use the XDocument class, your XML document is created as a series of linked .NET objects in memory. Figure 18-4 shows the object model. (The diagram is slightly simplified from what you ll find when you start using the XDocument class namely, it doesn t show the attributes, each of which is represented by an XAttribute object.)

create the StreamWriter and StreamReader classes on your own, or you can use one of the helpful shared methods included in the File class, such as CreateText() or OpenText(). Here s an example that gets a StreamWriter for writing data to the file c:\myfile.txt: ' Define a StreamWriter (which is designed for writing text files). Dim w As StreamWriter ' Create the file, and get a StreamWriter for it. w = File.CreateText("c:\myfile.txt") When you call the CreateText() method, you create the file and receive the StreamWriter object. At this point, the file is open and ready to receive your content. You need to write your data to the file, and then close it as soon as possible. Using the StreamWriter, you can call the WriteLine() method to add information to the file. The WriteLine() method is overloaded so it can write many simple data types, including strings, integers, and other numbers. These values are essentially all converted into strings when they re written to a file and must be converted back into the appropriate types manually when you read the file. w.WriteLine("This file generated by ASP.NET") w.WriteLine(42) ' Write a string. ' Write a number.

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