Simple .NET/ASP.NET PDF document editor web control SDK

for the attribute value an IntelliSense pop up appears showing the text <New Event Handler> . If you press the Tab or Enter key, Visual Studio will fill in the attribute value with myButton_Click. No matter which way you add an event, Visual Studio populates the attribute by taking the first part from the element s name, as specified with the x:Name attribute, and adding the event name on the end:

<Button x:Name="myButton" HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="20" Content="Click me!" Click="myButton_Click" />

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C:\> curl -I http://example.com/index.html HTTP/1.1 200 OK Date: Thu, 10 Jan 2008 09:03:29 GMT Server: Apache/2.2.3 (CentOS) Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT ETag: "280100-1b6-80bfd280" Accept-Ranges: bytes Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8

It doesn t just edit the Xaml it also adds a method with this name to the code behind file. You can go to the code behind by pressing F7, or you can find it in the Solution Explorer if you expand a Xaml file node, you ll see a .xaml.cs file inside it, and that s the code behind. Example 20-2 shows the click handler, along with some additional code in bold. (You re not obligated to use this naming convention for handlers, by the way. You could rename it after Visual Studio creates the handler, as long as you change both the Xaml and the code behind.)

private void myButton_Click(object sender, RoutedEventArgs e) { messageText.Text = "Hello, world!"; }

A content management system (CMS) is server-based software that allows you to manage web site content through a browser. It usually contains a number of programming languages, such as PHP, JavaScript, MySQL, HTML, and CSS, and it uses a database to save content and configuration settings. The user interface (UI) is designed for the end user, meaning little to no programming skills are required to use the system. Users can log in and easily add, edit, or delete web site pages. Although Drupal is a CMS, it is often referred to as a content management framework. A framework refers to a software or application platform that allows software to run; it contains the source code upon which software is built. In this sense, Drupal has a core set of modules you can hook into to build and expand your web app. You can write your own modules, use modules written by others, include custom scripts, integrate with other systems, and more. As a framework, Drupal becomes the glue that holds everything together.

The curl command shown in listing 16.1 is a Unix command that allows you to issue an HTTP GET request for a URL and return the output. The I switch tells it to display

Because the Xaml refers to this handler method in the Button element s Click attribute, the method will run anytime the button is clicked. The one line of code we added here refers to the TextBlock element. If you look at the Xaml, you ll see that the element s x:Name attribute has a value of messageText, and this lets us use this name in the code behind to refer to that element. Example 20-2 sets the Text property, which, as you ve no doubt guessed, causes the TextBlock to show the specified text when the button is clicked.

Just to be clear, this is happening on the client side. The Silverlight plugin downloads your application and then renders the UI as defined by your Xaml. It hosts your code behind (and any other code in your Silverlight project) inside the web browser process, and calls the specified event handlers without needing to communicate any further with the web server. Silverlight applications can communicate back with the web server after being loaded, but this click-handling interaction does not involve the server at all, unlike clicking a button on a normal web form.

The Xaml in Example 20-1 and the C# in Example 20-2 both set the Text of the TextBlock. The Xaml does this using standard XML s attribute syntax, while the C# code does it using normal C# property syntax. This highlights an important feature of Xaml: elements typically correspond to objects, and attributes correspond either to properties or to events.

the HTTP response headers. This and other Unix commands are available on Windows via the Cygwin shell for Windows (http://cygwin.com). The response returned contains a Content-Type header set to text/html; charset=UTF-8, which specifies both a MIME type for the content and the character encoding. The file extension has no meaning in this situation.

Although Xaml is the usual mechanism for defining the user interface of WPF and Silverlight applications, it s not strictly necessary. You could remove the bold code in Example 20-1 that adds the Button and TextBlock to the Xaml, and instead modify the class definition and constructor in the code behind, as Example 20-3 shows.