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Once Visual Studio has created the project, it shows a file called MainPage.xaml. This is a Xaml file defining the appearance and layout of your user interface. Initially, it contains just a couple of elements: a <UserControl> at the root (or a <Window> in a WPF project), and a <Grid> inside this. We ll add a couple of elements to the user interface so that there s something to interact with. Example 20-1 shows the Xaml you get by default with a new Silverlight project, along with two new elements: a Button and a TextBlock; the additional content is shown in bold.

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<UserControl x:Class="SimpleSilverlight.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" d:DesignHeight="300" d:DesignWidth="400"> > <Grid x:Name="LayoutRoot" Background="White"> <Button x:Name="myButton" HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="20" Content="Click me!" /> <TextBlock x:Name="messageText" Text="Message will appear here" TextWrapping="Wrap" TextAlignment="Center" FontSize="30" FontWeight="Bold" HorizontalAlignment="Center" VerticalAlignment="Center" /> </Grid> </UserControl>

The history of the URL can be traced back to the very first web servers, where it was primarily used to point directly to documents in a folder structure. This URL would ve been typical of an early URL, and it s reasonably well structured and descriptive:

Visual Studio presents Xaml in a split view. At the top it shows how it looks, and at the bottom it shows the Xaml source. You can either edit the source directly or drag items around on the design view at the top, adding new items from the Toolbox. As you make changes in one view the other view updates automatically.

If you run the application by pressing F5, Visual Studio will show the Silverlight application in a web page, as you can see in Figure 20-1.

It seems to be pointing to information on roses, and the domain also seems to have a logical hierarchy. But hold on, what s that .html extension on the end of the URL This is where things started to go wrong for our friend the URL. Of course, .html is a file extension because the web server is mapping the path in the URL directly to a folder of files on the disk of the web server. The category of plants in our URL is created by having a folder called plants containing all documents about plants. The key thing here is that the file extension of .html is probably redundant in this context, because the content type is being specified by the Content-Type header returned as part of the HTTP response. An example HTTP header is shown in listing 16.1, with the Content-Type header displayed in bold.

The release of Drupal 7 is a milestone in the evolution of Drupal. The major emphasis on improving the user interface resulted in a powerful and easy-to-use system on which to build web sites. If you are considering Drupal for your web site and haven t made a decision, I encourage you to read this introduction. This book is a guide to help you build a Drupal-powered web site from start to completion. I cover the concepts behind the Drupal system, describe modules that expand the system, and provide many stepby-step tutorials on how to build a specific piece of functionality or configure a module. I even discuss many peripheral tasks when building a Drupal site, such as setting up and configuring a server, creating test sites, and managing updates. My goal is to give you the tools you need to succeed as a Drupal site builder, regardless of how much or how little you know about creating a web site. I have built a successful web development business specializing in Drupal. I have found that any feature you or a client requires in a web site can be accomplished through this powerful system. I don t do Joomla, WordPress, Expression Engine, or any other CMS, simply because Drupal can do it better and faster. I believe so much in Drupal that I am committing 10 percent of all profits from this book to the Drupal association to help further the goals of Drupal. I hope by the end of this book you share this same passion.

This simple Silverlight example contains a button, but if you click it, nothing will happen because we have not defined any behavior. Xaml files in WPF and Silverlight are usually paired with a so-called code behind file, a C# (or VB.NET, or whatever language you re using) file that contains code associated with the Xaml file, and we can use this to make the button do something. The easiest way to add a click handler for the button to your code behind is from the Xaml file. You can just double-click the button on the design view and it will add a click handler. In fact, most user interface elements offer a wide range of events, so you might want a bit more control. You could select the item on the design surface and then go to the Properties panel it has an Events tab that lists all the available events, and you can double-click on any of these to add a handler. Or if you prefer typing, you can add a handler from the Xaml source editor view. If you go to the Button element and start adding a new Click attribute, you ll find that when you type the opening quote