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The SimpleHybridLock contains two fields: an Int32, which will be manipulated via the primitive user-mode constructs, and an AutoResetEvent, which is a primitive kernel-mode construct . To get great performance, the lock tries to use the Int32 and avoid using the AutoResetEvent as much as possible . Just constructing a SimpleHybridLock object causes the AutoResetEvent to be created, and this is a massive performance hit compared to the overhead associated with the Int32 field . Later in this chapter, we ll see another hybrid construct (AutoResetEventSlim) that avoids the performance hit of creating the AutoResetEvent until the first time contention is detected from multiple threads accessing the lock at the same time . The Dispose method closes the AutoResetEvent, and this is also a big performance hit compared to the overhead of destroying the Int32 field . While it would be nice to improve the performance of constructing and disposing of a SimpleHybridLock object, it would be better to focus on the performance of its Enter and Leave methods because these methods tend to be called many, many times over the object s lifetime . Let s focus on these methods now .

<Slider x:Name="sldr" Maximum="100" Orientation="Vertical" IsDirectionReversed="True" LargeChange="10"> </Slider>

This graphic shows the layout of the page using the ModalPopup extender in Visual Studio 2010:

In a composite application, modules must be discovered and loaded at run time by the host application In Prism, a module catalog is used to specify which modules are to be loaded, when they will be loaded, and in the order in which they will be loaded The module catalog is used by the ModuleManager and ModuleLoader components, which are responsible for downloading the modules if they are remote, loading the module s assemblies into the application domain, and initializing the module Prism allows the module catalog to be specified in different ways, including programmatically in code, declaratively in XAML, or in a configuration file You can also implement a custom module catalog if you need to Shell The shell is the host application into which modules are loaded.

Sample of Visual Basic Code Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Profile.FirstName = TextBoxFirst.Text Profile.LastName = TextBoxLast.Text Profile.Save() End Sub Sample of C# Code protected void Button1_Click(object sender, EventArgs e) { Profile.FirstName = TextBoxFirst.Text; Profile.LastName = TextBoxLast.Text; Profile.Save(); }

additional features such as caching the HTML file to disk to improve performance for future requests. Some customers might trust the company that produces the browser and configure the CAS policy to allow access to the file system; other customers might not want the browser to access the file system at all. By requesting optional permissions, the browser can operate in both environments. Customers who allow cached files might benefit from improved performance; customers who don't allow cached files can still view HTML pages. The following code fragment demonstrates how optional permissions can be used. Note that the CLR throws a SecurityException when an operation that requires an optional permission is attempted and the permission hasn't been granted; it's the responsibility of the programmer to catch this exception.

The Build Steps section of the Build Details window (shown in Figure 12-7) displays a line for each of the steps executed in the build process. Each build step consists of three parts: 1. Status Icon 2. Message 3. Completed On Date/Time

Existing Ranges (Islands)

The shell defines the overall layout and structure of the application, but it is typically unaware of the exact modules that it will host It usually implements common application services and infrastructure, but most of the application s functionality and content is implemented within the modules The shell also provides the top-level window or visual element that will then host the different UI components provided by the loaded modules Views Views are UI controls that encapsulate the UI for a particular feature or functional area of the application Views are used in conjunction with the MVVM or Model-View-Presenter (MVP) patterns, which are used to provide a clean separation of concerns between the UI and the application s presentation logic and data Views are used to encapsulate the UI and define user interaction behavior, thereby allowing the view to be updated or replaced independently of the underlying application functionality.