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The next example demonstrates the file access techniques described in the previous sections to create a simple guest book. The page actually has two parts. If there are no current guest entries, the client will see only the controls for adding a new entry, as shown in Figure 18-4.

For example, if you want to find the child <Product> elements in the <SuperProProductList>, you would add this code: // Use the Elements() method, because there are several matching elements var productElements = superProProductListElementElements("Product") Here, the code uses the var statement to simplify the code line (Technically, the Elements() method returns an IEnumerable<XElement> collection This design gives the XDocument more flexibility It means the Elements() method can return any collection it wants, as long as the collection supports the IEnumerable<T> interface) Getting the text inside an XElement is easy You simply need to cast the element to the appropriate data type, as shown here: XElement priceElement = productElementElement("Price"); decimal price = (decimal)priceElement; This works because the XElement class defines specialized conversion operators.

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Figure 18-4. The initial guest book page When the user clicks Submit, a file will be created for the new guest book entry. As long as at least one guest book entry exists, a GridView control will appear at the top of the page, as shown in Figure 18-5.

This tag must immediately precede a global variable and is applicable only to phpDocumentor-parsed documentation It is not useful for reflection-based parsing Tells the parser to ignore an element and to not include it in documentation Allows you to hide certain information from public documentation It can be used in-line as well as on a new line Specifies the URL to the license this software is used under and optionally describes the license name Includes a link in your documentation This tag may be used in-line Describes the parameters associated with functions and methods This is probably the most important tag The variable name argument can optionally include , to indicate there may be an unlimited number of other parameters passed to the function This tag may appear multiple times in a block (See Listing 6-2 for examples) Describes the type of data returned by a function or method.

When you cast an XElement to a decimal value, for example, the XElement automatically retrieves its inner value and attempts to convert that to a decimal Setting the text content inside an element is nearly as easy You simply assign the new content to the Value property, as shown here: priceElementValue = (decimal)priceElement * 2; You can use the same approach to read and set attributes with the XAttribute class Here s a straightforward code routine that mimics the XML processing code you saw earlier with the XmlTextReader It scans through the elements that are available, creates a list of products, and displays that in a grid..

Figure 18-5. The full guest book page The GridView that represents the guest book is constructed using data binding, which you explored in s 16 and 17. Technically speaking, the GridView is bound to a collection that contains instances of the BookEntry class. The BookEntry class definition is included in the code-behind file for the web page and looks like this: Public Class BookEntry Private _author As String Private _submitted As Date Private _message As String Public Property Author() As String Get Return _author End Get Set(ByVal Value As String) _author = Value End Set End Property

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