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For the purposes of this book, we re going to use free, or as cheap as possible, tools to build all of the examples. Both of the database servers that we ll use SQL Server 2005 Express and MySQL 5.0, can be downloaded for free, and we ll use Visual Web Developer 2005 Express as our development environment. Visual Web Developer 2005 Express is a cut-down version of Visual Studio 2005. Although it doesn t provide any of the high-end features of Visual Studio 2005, it does offer the same environment for building Web sites. Visual Web Developer 2005 Express provides code highlighting, error checking, and most of the features that you would expect from a full-fledged development environment. It also includes its own mini Web server (the ASP.NET Development Server), so those of you without access to a server running Internet Information Services (IIS) can work through the exercises in this book. At the moment, you can download Visual Web Developer 2005 Express for free from http://msdn.microsoft.com/vstudio/express/vwd for the next year, and after that, you ll have to pay for it. Although we re using the cut-down versions of SQL Server 2005 and Visual Studio 2005, if you happen to have access to the full-fledged versions, you ll also be able to work through all of the examples in the book. The differences are very minor for example, some menus may be in slightly different places so you should find it easy to follow along.

Note After you type your username and password, it s not enough to just press the Enter key while the

Now, when Cache( Key 1 ) changes or is removed from the cache, Cache( Key 2 ) will automatically be dropped from the cache as well. Figure 26-9 shows a simple test page that is included with the online samples for this chapter. It sets up a dependency, modifies the file, and allows you to verify that the cached item has been dropped from the cache.

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A more complex kind of cache dependency is the SQL Server cache dependency. It s one of the most widely touted new ASP .NET 2.0 features. In a nutshell, SQL cache dependencies provide the ability to automatically invalidate a cached data object (such as a DataSet) when the related data is modified in the database. This feature is supported in both SQL Server 2005 (including the Express Edition) and in SQL Server 2000, although the underlying plumbing is quite a bit different.

Caution If you re going to run this example (and the rest of the examples in this book), you ll need to

focus is on the Password text box or on the check box. You need to press the Tab key to give the Log In button the focus or click the Log In button with the mouse. You ll fix this problem in the next steps by using the TieButton method that you implemented in 5 (I told you that method would be useful!).

Using SQL cache dependencies still entails more complexity than just using a time-based expiration Tip

policy. If it s acceptable for certain information to be used without reflecting all the most recent changes (and developers often overestimate the importance of up-to-the-millisecond live information), you may not need it at all.

install, as a minimum, .NET Framework 2.0 and Visual Web Developer 2005 Express. Refer to Appendix A for full instructions and come back here when you re ready to continue.

ASP .NET uses a polling model for SQL Server 2000 and SQL Server 7. Older versions of SQL Server and other databases aren t supported (although third parties can implement their own solutions by creating a custom dependency class). With the polling model, ASP .NET keeps a connection open to the database and checks periodically whether a table has been updated. The effect of tying up one connection in this way isn t terribly significant, but the extra database work involved with polling does add some database overhead. For the polling model to be effective, the polling process needs to be quicker and lighter than the original query that extracts the data. You must take several steps to enable notification with SQL Server 2000. Here s an overview of the process: 1. The first step is to determine which tables need notification support. 2. Next, use the aspnet_regsql.exe command-line utility to create the notification tables for your database. 3. Then, you need to register each table that requires notification support. You also use the aspnet_regsql.exe command for this step. 4. Finally, you enable ASP.NET polling through a web.config file. You re now ready to create SqlCacheDependency objects. The following sections describe these steps.

17. Continue by doing a few cosmetic changes to your page. To make the Login control fully customizable by having access to its individual constituent controls, you need to convert it to a template. Click its Smart Link and choose Convert to Template, as shown in Figure 8-11.

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