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Recall that a style can be applied at runtime as well. This can be helpful if you want to let end users choose how their UI looks and feels, or if you need to enforce a look and feel based on security settings (e.g., the DisableAllButton style) or what have you. During this project, you have defined a number of styles, many of which can apply to Button controls. So, let s retool the UI of our main window to allow the user to pick from some of these styles by selecting names in a ListBox. Based on the user s selection, we will apply the appropriate style. Here is the new (and final) markup for the <Window> element: <Window x:Class="WpfStyles.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="350" Title="A Window with Style!" Width="525" WindowStartupLocation="CenterScreen"> <DockPanel > <StackPanel Orientation="Horizontal" DockPanel.Dock="Top"> <Label Content="Please Pick a Style for this Button" Height="50"/> <ListBox x:Name ="lstStyles" Height ="80" Width ="150" Background="LightBlue" SelectionChanged ="comboStyles_Changed" /> </StackPanel> <Button x:Name="btnStyle" Height="40" Width="100" Content="OK!"/> </DockPanel> </Window> The ListBox control (named lstStyles) will be filled dynamically within the window s constructor like so: public MainWindow() { InitializeComponent(); // Fill the list box with all the Button // styles. lstStyles.Items.Add("GrowingButtonStyle"); lstStyles.Items.Add("TiltButton"); lstStyles.Items.Add("BigGreenButton"); lstStyles.Items.Add("BasicControlStyle"); } The final task is to handle the SelectionChanged event in the related code file. Notice in the following code how we are able to extract the current resource by name, using the inherited TryFindResource() method: private void comboStyles_Changed(object sender, SelectionChangedEventArgs e) { // Get the selected style name from the list box. Style currStyle = (Style) TryFindResource(lstStyles.SelectedValue);

N ote At the beginning of the class, I used the event metatag to make the ButtonMoveEvent event visible as

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The BufferResponse property allows you to control when the data returned from the web service is sent to the client. By default the BufferResponse property is set to True. This means the entire result is serialized before it is sent to the client. By setting this property to False (as follows), ASP.NET will start outputting the content straight away, without waiting for all the data to be serialized: <WebMethod(BufferResponse:=False)> _ Public Function GetLargeStreamOfData() As Byte() ... End Function The web service method will always finish executing before anything is returned. The BufferResponse setting applies to the serialization that takes place after the method has executed. With buffering turned off, the first part of the result is serialized and sent. Then the next part of the result is serialized and sent, and so on. Setting BufferResponse to False makes sense only when the web service returns a large amount of data. Even then, it rarely makes any difference, because the automatically generated .NET proxy class doesn t have the ability to start processing the returned data piece by piece. This means the proxy class will still wait for all the information to be received before it passes it back to your application. However, you can change this behavior by taking direct control over the XML message processing with the IXmlSerializable interface, as described in the next chapter.

if (currStyle != null) { // Set the style of the button type. this.btnStyle.Style = currStyle; } } When you run this application, you can pick from one of these four button styles on the fly. Figure 30-19 shows our completed application.

Web services, like any other piece of .NET code, can initiate ADO.NET transactions. Additionally, web services can easily participate in COM+ transactions. COM+ transactions are interesting because they allow you to perform a transaction that spans different resources (for example, a SQL Server database, a Microsoft Messaging message queue, and an Oracle database). COM+ transactions also commit or roll back automatically. However, you must pay a price for these added features and convenience because COM+ transactions use a two-stage commit protocol, they are always slower than using ADO.NET client-initiated transactions or stored procedure transactions. The support for COM+ transactions in a web service is also somewhat limited. Because of the stateless nature of HTTP, web service methods can act only as the root object in a transaction. This means a web service method can start a transaction and use it to perform a series of related tasks, but multiple web services cannot be grouped into one transaction. As a result, you may have to put in some extra thought when you re creating a transactional web service. For example, it won t make sense to create a financial web service with separate DebitAccount() and CreditAccount() methods, because they won t be able to be grouped into a transaction. Instead, you can make sure both tasks execute as a single unit using a transactional TransferFunds() method.

To wrap up our examination of WPF styles, let s take a quick tour of how Blend can help automate the process of style construction. Again, however, I ll hold off discussing the animation editor (and related topics, such as triggers and control templates) until the next chapter. Here I want to point out the default Simple Styles of the Assets Library.

Blend ships with a number of default styles for common controls, referred to as the Simple Styles. If you open the Assets Library, you can locate the Styles in the tree view on the left-hand side (Figure 30-20).

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