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The XPathNavigator works similarly to the XmlDocument class. It loads all the information into memory and then allows you to move through the nodes. The key difference is that it uses a cursorbased approach that allows you to use methods such as MoveToNext() to move through the XML data. An XPathNavigator can be positioned on only one node a time. You can create an XPathNavigator from an XmlDocument using the XmlDocument.CreateNavigator() method. Here s an example: private void Page_Load(object sender, System.EventArgs e) { string xmlFile = Server.MapPath("DvdList.xml"); // Load the XML file in an XmlDocument. XmlDocument doc = new XmlDocument(); doc.Load(xmlFile); // Create the navigator. XPathNavigator xnav = doc.CreateNavigator(); XmlText.Text = GetXNavDescr(xnav, 0); } In this case, the returned object is passed to the GetXNavDescr() recursive method, which returns the HTML code that represents the XML structure, as in the previous example. The code of the GetXNavDescr() method is a bit different from the GetChildNodesDescr() method in the previous example, because it takes an XPathNavigator object that is positioned on a single node, not a collection of nodes. That means you don t need to loop through any collections. Instead, you can simply examine the information for the current node, as follows: private string GetXNavDescr(XPathNavigator xnav, int level) { string indent = ""; for (int i=0; i<level; i++) indent += "     "; StringBuilder str = new StringBuilder(""); switch(xnav.NodeType) { case XPathNodeType.Root: str.Append("<b>ROOT</b>"); str.Append("<br />"); break; case XPathNodeType.Element: str.Append(indent); str.Append("Element: <b>"); str.Append(xnav.Name); str.Append("</b><br />"); break; case XPathNodeType.Text: str.Append(indent); str.Append(" - Value: <b>"); str.Append(xnav.Value); str.Append("</b><br />"); break; case XPathNodeType.Comment: str.Append(indent); str.Append("Comment: <b>"); str.Append(xnav.Value);

You ll find that some other ASP.NET features use cookies. Two examples are session state (which allows you to temporarily store user-specific information in server memory) and forms security (which allows you to restrict portions of a website and force users to access it through a login page).

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Application state is similar to session state It supports the same type of objects, retains information on the server, and uses the same dictionary-based syntax A common example with application state is a global counter that tracks how many times an operation has been performed by all of the web application s clients For example, you could create a globalasax event handler that tracks how many sessions have been created or how many requests have been received into the application Or you can use similar logic in the PageLoad event handler to track how many times a given page has been requested by various clients Here s an example of the latter: Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Dim count As Integer = CInt(Application("HitCounterForOrderPage")) count += 1 Application("HitCounterForOrderPage") = count lblCounterText = count.

Session state is the heavyweight of state management. It allows information to be stored in one page and accessed in another, and it supports any type of object, including your own custom data types. Best of all, session state uses the same collection syntax as view state. The only difference is the name of the built-in page property, which is Session. Every client that accesses the application has a different session and a distinct collection of information. Session state is ideal for storing information such as the items in the current user s shopping basket when the user browses from one page to another. But session state doesn t come for free. Though it solves many of the problems associated with other forms of state management, it forces the web server to store additional information in memory. This extra memory requirement, even if it is small, can quickly grow to performance-destroying levels as hundreds or thousands of clients access the site.

str.Append("</b><br />"); break; } ... Note that the values for the NodeType property are almost the same, except for the enumeration name, which is XPathNodeType instead of XmlNodeType. That s because the XPathNavigator uses a smaller, more streamlined set of nodes. One of the nodes it doesn t support is the XmlDeclaration node type. The function checks if the current node has any attributes. If so, it moves to the first one with a call to MoveToFirstAttribute() and loops through all the attributes until the MoveToNextAttribute() method returns false. At that point it returns to the parent node, which is the node originally referenced by the object. Here s the code that carries this out: ... if (xnav.HasAttributes) { xnav.MoveToFirstAttribute(); do { str.Append(indent); str.Append(" - Attribute: <b>"); str.Append(xnav.Name); str.Append("</b> Value: <b>"); str.Append(xnav.Value); str.Append("</b><br />"); } while (xnav.MoveToNextAttribute()); // Return to the parent. xnav.MoveToParent(); } ... The function does a similar thing with the child nodes by moving to the first one with MoveToFirstChild() and recursively calling itself until MoveToNext() returns false, at which point it moves back to the original node, as follows: ... if (xnav.HasChildren) { xnav.MoveToFirstChild(); do { str.Append(GetXNavDescr(xnav, level+1)); } while (xnav.MoveToNext()); // Return to the parent. xnav.MoveToParent(); } return str.ToString(); } This code produces almost the same output as shown in Figure 12-2.

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