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as a simple text file. This is a common technique for storing information in a web application, but it s quite a bit different from the file access code you ve seen in this chapter. Cookies are created on the client side rather than on the server. This means your ASP.NET code may be able to use them on subsequent requests from the same user, but they aren t suitable when storing information you need to review later, information that s more permanent, or information that affects more than one user.

Here s an example that creates an element with three nested elements and their content: XElement element = new XElement("Product", new XElement("ID", 3), new XElement("Name", "Fresh Fruit Basket"), new XElement("Price", "49.99") ); Here s the scrap of XML that this code creates: <Product> <ID>3</ID> <Name>Fresh Fruit Basket</Name> <Price>49.99</Price> </Product> You can extend this technique to create an entire XML document, complete with elements, text content, attributes, and comments. For example, here s the complete code that creates the SuperProProductList.xml document in memory. When the document is completely built, the code saves it to a file using the XDocument.Save() method. // Build the XML content in memory. XDocument doc = new XDocument( new XDeclaration("1.0", null, "yes"), new XComment("Created with the XDocument class."), new XElement("SuperProProductList", new XElement("Product", new XAttribute("ID", 1), new XAttribute("Name", "Chair"), new XElement("Price", "49.33") ), new XElement("Product", new XAttribute("ID", 2), new XAttribute("Name", "Car"), new XElement("Price", "43399.55") ), new XElement("Product",

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/** I am a PHPDoc comment and I describe somefunction */ function somefunction() {} This follows the format of all doccomments, so you are likely wondering what makes it special The answer is tags! Tags are specified by the @ symbol and a predefined identifier They can occur at the beginning of a line or may be enclosed in curly braces ({}) and placed free-form anywhere within the comment The allowable identifiers are predefined, and they form the rules for how a documentation parser will interpret your comments /** I am a PHPDoc comment @param bool $foo Foo tells the function something */ function bar($foo) {} Notice that a @param tag describes the function s $foo argument This is metadata and can later be read by a parser to output documentation about $foo.

You can also read and write to binary files Binary data uses space more efficiently but also creates files that aren t human-readable If you open a file in Notepad, you ll see a lot of extended ASCII characters (politely known as gibberish) To open a file for binary writing, you need to create a new BinaryWriter object The constructor accepts a stream, which you can retrieve using the FileOpenWrite() method Here s the code to open the file c:\binaryfilebin for binary writing: Dim w As New BinaryWriter(FileOpenWrite("c:\binaryfilebin")) NET concentrates on stream objects, rather than the source or destination for the data This means you can write binary data to any type of stream, whether it represents a file or some other type of storage location, using the same code.

new XAttribute("ID", 3), new XAttribute("Name", "Fresh Fruit Basket"), new XElement("Price", "49.99") ) ) ); // Save the document. doc.Save(file); This code creates the same XML content as the XmlTextWriter code you considered earlier. However, this code is shorter and easier to read.

In addition, writing to a binary file is almost the same as writing to a text file Dim str As String = "ASPNET Binary File Test" Dim int As Integer = 42 wWrite(str) wWrite(int) wFlush() wClose() Reading data from a binary file is easy, but not quite as easy as reading data from a text file The problem is that you need to know the data type of the data you want to retrieve To retrieve a string, you use the ReadString() method To retrieve an integer, you must use ReadInt32() That s why the preceding code example writes variables instead of literal values If the value 42 were hard-coded as the parameter for the Write() method, it wouldn t be clear if the value would be written as a 16-bit integer, 32-bit integer, decimal, or something else.

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