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Excel s default security settings do not allow any macro activity. Before you begin exploring macros in Excel and the Macro Recorder, you will need to tell Excel which security settings to use to control what happens when you open a workbook that contains macros (or one that will contain macros). If you use antivirus software that works with Microsoft Office 2007 and you open a workbook that contains macros, the virus scanner will check the workbook for viruses before opening it. You can make changes to the macro security settings in the Trust Center: 1. Click the Microsoft Office button, which looks like the following:

4: Object-Oriented Programming with C#

The role of 4 is to examine the details of how C# 2.0 accounts for each pillar of OOP: encapsulation, inheritance, and polymorphism. Once you have examined the keywords and the syntax used to build class hierarchies, you will then look at the role of XML code comments.

notation (X)HTML to indicate these cases. When things do apply specifically to HTML or XHTML and not both, we will use the appropriate name alone, without the parenthetical (X).

This chapter examines how the CLR manages memory using the .NET garbage collector. Here you will come to understand the role of application roots, object generations, and the System.GC type. Once you understand the basics, the remainder of this chapter covers the topics of disposable objects (via the IDisposable interface) and the finalization process (via the System.Object. Finalize() method).

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The point of this chapter is to discuss how to handle runtime anomalies in your code base through the use of structured exception handling. Not only will you learn about the C# keywords that allow you to handle such problems (try, catch, throw, and finally), but you will also come to understand the distinction between application-level and system-level exceptions. In addition, this chapter examines various tools within Visual Studio 2005 that allow you to debug the exceptions that have escaped your view.

2. Click the Excel Options button, select Trust Center, click the Trust Center Settings button, and finally click the Macro Settings item. Alternatively, on the Developer ribbon, click the Macro Security button in the Code Group section. (Depending on the network security level at your organization, you may or may not have rights to change these settings).

The material in this chapter builds upon your understanding of object-based development by covering the topic of interface-based programming. Here you will learn how to define types that support multiple behaviors, how to discover these behaviors at runtime, and how to selectively hide particular behaviors using explicit interface implementation. To showcase the usefulness of interface types, the remainder of this chapter examines the System.Collections namespace.

There are numerous real-world advantages to separating content and style, and most of you are probably already aware of them. We ll recap, just in case. By separating the two layers of your document, you make it simple to add, remove, or update content without having to worry about botching up your layout. You also make it easy to change the font used for the entire site without having to dig through your content in search of every single <font> tag. Separating the two layers allows a web team to work efficiently; your visual designers can focus on design while your content producers focus on content and neither has to worry about the other getting in their way. If you re a solo developer, you ll find that the separation of content and presentation allows you to keep your frames of mind separate as well. When you need to make a change to content, you won t have to dig through a bunch of style code to find what you re looking for.

The purpose of 8 is to demystify the delegate type. Simply put, a .NET delegate is an object that points to other methods in your application. Using this pattern, you are able to build systems that allow multiple objects to engage in a two-way conversation. After you have examined the use of .NET delegates (including numerous 2.0-specific features such as anonymous methods), you will then be introduced to the C# event keyword, which is used to simplify the manipulation of raw delegate programming.

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