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Although Silverlight was available for earlier versions of .NET and Visual Studio, I decided to include a brief introduction because Silverlight was released between VS2008 and VS2010, and I suspect that many developers are not aware of how easy it is to use. I believe Silverlight will grow in importance and is something that all .NET developers should at least be aware of.

A compilation symbol is an identifier that has only two possible states. It is either defined or undefined. A compilation symbol has the following characteristics: It can be any identifier except true or false. This includes C# keywords and identifiers declared in your C# code both of which are fine. It has no value. Unlike in C and C++, it does not represent a string. As shown in Table 23-1: The #define directive declares a compilation symbol. The #undef directive undefines a compilation symbol.

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Vector graphics are stored completely differently. Whereas bitmap images are stored encoding a specific number of pixels laid out in a rectangle, vector graphics don t deal in pixels. Vector images have the following characteristics: They re stored as a set of mathematical formulas representing geometric shapes, points, and curves comprising the image. Because the formulas specify relationships, the actual size of the image on the screen doesn t matter. It can be scaled infinitely.

When Silverlight was first released, it was inevitable that it would be compared to Adobe Flash (and Flex) due to its similar function. Although there is overlap between the two products, I don t think Microsoft s primary intention was to just launch a competing product.

#define PremiumVersion #define EconomyVersion ... #undef PremiumVersion The #define and #undef directives can be used only at the top of a source file, before any C# code is listed. After the C# code has started, the #define and #undef directives can no longer be used. using System; #define PremiumVersion namespace Eagle { #define PremiumVersion ... // First line of C# code // Error

Silverlight s development was the obvious offshoot of WPF, and there was no satisfactory technology for the Microsoft developer to create RIAs prior to its release. Options such as ActiveX controls or embedded Windows forms suffered from being difficult to develop and debug, were not cross-platform, and had security and deployment issues. For a taste of just what is possible using Silverlight, take a look at the upcoming Microsoft Office Online application (http://channel9.msdn.com/posts/PDCNews/First-Look-Office-14-for-Web/). Office Online utilizes Silverlight to provide online versions of Word, Excel, and PowerPoint. Perhaps the biggest advantage offered by Silverlight is that applications can be written using the .NET framework and existing Microsoft tools such as Visual Studio. This immediately lowers the entry barrier to new developers and gives them access to much more functionality. Although Flash is almost certainly installed on more browsers than Silverlight, at the time of writing, Microsoft is in a strong position to encourage uptake of Silverlight (subject to future possible antitrust legislation!). It is hard to get accurate statistics about Silverlight uptake, but the sites http://www.riastats.com/ and http://www.statowl.com/silverlight.php are well worth a look. At the time of writing, they indicate that roughly 25 percent of browsers have some version of Silverlight installed. Adobe indicates that it has a much higher uptake, which is to be expected with a more mature product: http://www.adobe.com/products/player_census/flashplayer/.

Figure 1-4 shows the difference between a bitmap image and a vector image that have each been expanded to 200 percent of their original sizes. The bitmap image shows jagged edges where the pixel values have been interpolated. The vector image is much smoother.

The scope of a compilation symbol is limited to a single source file. Redefining a symbol that is already defined is perfectly fine as long as it s before any C# code, of course. #define AValue #define BValue #define AValue // Redefinition is fine.

An impressive example of a Silverlight application is Descry: A Website Named Desire that was created for the Mix conference. This web site illustrates the web site development process (see Figure 14-1) and is available online at http://www.visitmix.com/labs/descry/awebsitenameddesire/.

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