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Last but not least, it is possible to assign a theme in code. This can be helpful when you wish to provide a way for end users to select a theme for their current session. Of course, we have not yet showed you how to build stateful web applications, so the current theme selection will be forgotten between postbacks. In a production-level site, you may wish to store the user s current theme selection within a session variable, or persist the theme selection to a database. To illustrate how to assign a theme programmatically, update the UI of your Default.aspx file with three new Button controls as shown in Figure 33-25. Once you have done so, handle the Click event for each Button type.

On Internet Explorer browsers, it s acceptable to leave out the parameter for the send() method. However, in Firefox you must supply a null reference, or the callback will behave erratically. This is one of the many quirks you ll find in cross-browser compatibility when writing client-side script.

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Figure 33-25. The updated UI of the themes example Now be aware that you can only assign a theme programmatically during specific phases of your page s life cycle. Typically, this will be done within the Page_PreInit event. This being said, update your code file as follows: partial class _Default : System.Web.UI.Page { protected void btnNoTheme_Click(object sender, System.EventArgs e) { // Empty strings result in no theme being applied. Session["UserTheme"] = ""; // Triggers the PreInit event again. Server.Transfer(Request.FilePath); } protected void btnGreenTheme_Click(object sender, System.EventArgs e) { Session["UserTheme"] = "BasicGreen"; // Triggers the PreInit event again. Server.Transfer(Request.FilePath); } protected void btnOrangeTheme_Click(object sender, System.EventArgs e) { Session["UserTheme"] = "CrazyOrange";

Clearly, one detail is missing here. You ve learned how to send a request, but how do you handle the response The secret is to attach an event handler using the onreadystatechange property. This function is called when the request is finished and the data is available: xmlRequest.onreadystatechange = UpdatePage; Of course, you need to attach the event handler before you call the send() method to start the request. When the request is finished and your function is triggered, you can extract the information you need from the xmlRequest object using the responseText and responseXML properties. The responseText property gives you all the content in a single long string. The responseXML returns it as a tree of node objects.

Console.ReadLine(); } If you did not make use of the params modifier in the definition of CalculateAverage(), the first invocation of this method would result in a compiler error, as the compiler would be looking for a version of CalculateAverage() which took five double arguments.

Even though the name Ajax implies XML content, you can also return something else from the server, including plain text. For example, if the server is returning a single piece of data, there s no reason to wrap it up in a complete XML document.

Note To avoid any ambiguity, C# demands a method only support single params argument, which must be the final argument in the parameter list.

public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { PrintWriter out = res.getWriter(); try { out.println(getXml().toXML()); } catch (ValidityException e) { e.printStackTrace(); } catch (ParsingException e) { e.printStackTrace(); } out.close(); }

As you might guess, this technique is nothing more than a convenience for the caller, given that the array is created by the CLR as necessary. By the time the array is within the scope of the method being called, you are able to treat it as a full-blown .NET array that contains all the functionality of the System.Array base class library type. Consider the following output: You sent me 5 doubles. Average of data is: 32.864 You sent me 3 doubles. Average of data is: 4.3 You sent me 0 doubles. Average of data is: 0

Now that you ve taken a quick tour of the XmlHttpRequest object, you re ready to use it in a simple page. To build an Ajax-style page in ASP.NET, you need two pieces: The Ajax-enabled web page, which includes the client-side code for making the request through the XmlHttpRequest object Another page or resource that can handle the requests from the first page and send the appropriate response The first ingredient is obviously an .aspx web page. The second ingredient could be another .aspx web page, or it could be a custom HTTP handler. The HTTP handler is a more lightweight option, because it doesn t use the full-page model.

With the release of .NET 4.0, C# programmers are now able to create methods which can take optional arguments. This technique allows the caller to invoke a single method while omitting arguments deemed unnecessary, provided the caller is happy with the specified defaults.

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