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public partial class ItemRemovedCallbackTest : System.Web.UI.Page { protected void Page_Load(object sender, System.EventArgs e) { if (!this.IsPostBack) { lblInfo.Text += "Creating items...<br />"; string itemA = "item A"; string itemB = "item B"; Cache.Insert("itemA", itemA, null, DateTime.Now.AddMinutes(60), TimeSpan.Zero, CacheItemPriority.Default, new CacheItemRemovedCallback(ItemRemovedCallback)); Cache.Insert("itemB", itemB, null, DateTime.Now.AddMinutes(60), TimeSpan.Zero, CacheItemPriority.Default, new CacheItemRemovedCallback(ItemRemovedCallback)); } } protected void cmdCheck_Click(object sender, System.EventArgs e) { string itemList = ""; foreach(DictionaryEntry item in Cache) { itemList += item.Key.ToString() + " "; } lblInfo.Text += "<br />Found: " + itemList + "<br />"; } protected void cmdRemove_Click(object sender, System.EventArgs e) { lblInfo.Text += "<br />Removing itemA.<br />"; Cache.Remove("itemA"); } private void ItemRemovedCallback(string key, object value, CacheItemRemovedReason reason) { // This fires after the request has ended, when the // item is removed. // If either item has been removed, make sure // the other item is also removed. if (key == "itemA" || key == "itemB") { Cache.Remove("itemA"); Cache.Remove("itemB"); } } } Figure 11-6 shows a test of this page.

The next web-page example shows how to use the XmlTextWriter to create a well-formed XML file. The first step is to create a private WriteXML() method that will handle the job. It begins by creating an XmlTextWriter object and passing the physical path of the file you want to create as a constructor argument. Private Sub WriteXML() Dim xmlFile As String = Server.MapPath("DvdList.xml") Using writer As XmlTextWriter = XmlWriter.Create(xmlFile, Nothing) ... The XmlTextWriter has properties such as Formatting and Indentation, which allow you to specify whether the XML data will be automatically indented with the typical hierarchical structure and to indicate the number of spaces to use as indentation. You can set these two properties as follows: ... writer.Formatting = Formatting.Indented writer.Indentation = 3 ...

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Figure 11-6. Testing a cache callback The callback also provides your code with additional information, including the removed item and the reason it was removed. Table 11-4 shows possible reasons. Table 11-4. Values for the CacheItemRemovedReason Enumeration

As with breakpoints, any custom tasks you add by hand are stored in the hidden solution files. This makes them fairly fragile if you rename or move your project, these tasks will disappear without warning (or without even a notification the next time you open the website).

Remember, in a datacentric XML document, whitespace is almost always ignored. But by adding indentation, you create a file that is easier for a human to read and interpret, so it can t hurt.

Removed because a file or key dependency changed Removed because it expired (according to its sliding or absolute expiration policy) Removed programmatically by a Remove method call or by an Insert method call that specified the same key Removed because ASP .NET decided it wasn t important enough and wanted to free memory

The comment entries are more interesting, because they re added automatically and they link to a specific line in your code. To try the comment feature, move somewhere in your code, and enter the comment marker (//) followed by the word TODO (which is commonly referred to as a token tag). Now type in some descriptive text: // TODO: Replace this hard-coded value with a configuration file setting. string fileName = @"c:\myfile.txt" Because your comment uses the recognized token tag TODO, Visual Studio recognizes it and automatically adds it to the Task List (as shown in Figure 2-10).

Now you re ready to start writing the file. The WriteStartDocument() method writes the XML declaration with version 1.0 ( < xml version="1.0" > ), as follows: writer.WriteStartDocument() The WriteComment() method writes a comment. You can use it to add a message with the date and time of creation: writer.WriteComment("Created @ " & DateTime.Now.ToString()) Next, you need to write the real content the elements, attributes, and so on. This example builds an XML document that represents a DVD list, with information such as the title, the director, the price, and a list of actors for each DVD. These records will be child elements of a parent <DvdList> element, which must be created first: writer.WriteStartElement("DvdList") Now you can create the child nodes. The following code opens a new <DVD> element: writer.WriteStartElement("DVD") Now the code writes two attributes, representing the ID and the related category. This information is added to the start tag of the <DVD> element. ... writer.WriteAttributeString("ID", "1") writer.WriteAttributeString("Category", "Science Fiction") ...

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