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Other techniques we demonstrate in Appendix A, Dependency Injection with Unity, include using attributes to register type mappings and dependencies, defining named registrations, and specifying dependencies and values for parameters and properties. The one point to be aware of when you use the more sophisticated technique for creating objects is that your application is responsible for managing the container, holding a reference to it, and making that reference available to code that must access the container. In forms-based applications that automatically maintain global state (for example, applications built using technologies such as Windows Forms, Windows Presentation Foundation (WPF), and Silverlight ), you can use an application-wide variable for this. However, in request-based applications built using technologies such as ASP.NET, ASMX, and Windows Communication Foundation (WCF), you generally require additional code to maintain the container and make it available for each request. We discuss some of the ways that you can achieve this in Appendix B, Dependency Injection in Enterprise Library, and you will find full details in the documentation installed with Enterprise Library and available online at http://go.microsoft.com/fwlink/ LinkId=188874.

And here is an example that uses the checked operator:

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Although this chapter touched on all the key aspects of the .NET Remoting technology, it revealed only the tip of the iceberg. Throughout the chapter, I've noted several aspects of .NET Remoting whose coverage was simply beyond the scope of a book about XML. Principal among the resources that cover these topics in more detail is the MSDN .NET Framework documentation, but many other appropriate resources are also available. I mentioned that Windows XP and newer systems boast a modified loader that looks directly into the source Portable Executable (PE) file to find .NET Framework-specific metadata. To understand the entire loading process of managed executables in Windows XP as well as in Windows 2000, I know just one resource: Jeffrey Richter's excellent book Applied Microsoft .NET Framework Programming (Microsoft Press, 2002). In the October 2002 issue of MSDN Magazine, you can find an article of mine that, like this chapter, attempts to explain the ABCs of .NET Remoting. In that article, you'll find a deeper discussion of architectural aspects channels, formatters, and sink chains than we've covered here. The internal engine that performs memory management for instances of remote objects is the lease manager (LM). Jeff Prosise, in 15 of his book Programming Microsoft .NET (Microsoft Press, 2002), explains a lot about it. Finally, if you're just looking for a complete .NET Remoting book, here it is: Microsoft .NET Remoting, by Scott McLean, James Naftel, and Kim Williams (Microsoft Press, 2002).

If the page worked as expected from the start, you re certainly one lucky programmer! Most of the time, errors happen because of typos, so watch out for them! Database access problems are also common, so make sure you correctly configured the hatshop database and the hatshopadmin user, as shown in 2. In any case, we re lucky to have a good error-reporting mechanism, which shows a detailed error report if something goes wrong. Figure 3-15 shows the error message I received when mistyping the database password in config.php.

To export to Excel from a standard view, follow these steps: 1. Choose a standard view that includes the columns of data you want to export. If a suitable view doesn t exist, create it (see 4 for detailed instructions on creating views). Don t worry about grouping or totals they won t be included in the exported data. 2. With your view selected, click the Export to Spreadsheet link on the Actions list on the left side of the screen to open the File Download dialog box, shown in Figure 3-2.

If you re a teacher or an instructor, your column headings might be Lesson, Explanation, and Detail:

Note CASE expressions may contain other CASE expressions. The only limitation is that a single CASE may have a maximum of 255 conditional expressions. Even though you can create large CASE expressions, take care to not use so many embedded conditions that your logic is hard to follow.

TABLE 20-2

In the Network Mask text box, type: 255.255.255.0. In the Metric text box, accept the displayed value of 1, and then click OK.

AppDomain that the types are loaded into is unloaded . A common way to leak memory is to have a static field refer to a collection object and then to keep adding items to the collection object . The static field keeps the collection object alive and the collection object keeps all its items alive . For this reason, it is best to avoid static fields whenever possible .

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