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Shows the table of contents for the Help file. This is the most common option if you aren t linking to a specific topic. Shows the index for the Help file, if it exists. Shows the index, and automatically highlights the first topic that matches the HelpKeyword property. For example, if HelpKeyword is format for this control, the most similar entry is highlighted in the index list. Shows the index and automatically highlights the index entry for the first letter of the HelpKeyword. Shows the search page for the Help file, which allows the user to perform unguided text searches. This feature tends to provide poorer (and slower) results than the index or table of contents, and is best avoided if possible. Shows the topic page that has the unique topic URL specified by the HelpKeyword property. For example, the HelpKeyword might be welcome.htm which instructs the HelpProvider to jump straight to the topic page named Welcome. Similar to Topic, but instead of matching the topic URL, matches a unique number (called the topic identifier).

Note How to write use cases can be a fairly complex and scientific process, and entire volumes have

Select both the Products and ProductsComponents tables as shown in Figure 15-2, and click the Add button followed by the Close button.

Both the Topic and TopicID values are used to create context-sensitive Help in conjunction with the HelpKeyword property. You ll see it in action in the next section.

As you saw in the previous section, binding Help files to .NET controls is easy thanks to the HelpProvider. However, getting the result you want a well-integrated Help system is a little trickier, because it requires some knowledge of Help standards. In this section, you ll walk through creating a basic HTML Help file and using it to add context-sensitive Help to an application.

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been devoted to the topic. It is not our intention to detail the myriad software development practices here, only to highlight the benefits of use cases in the overall process of refining customer demands into a workable framework for developing database applications. Use cases are the first step in the long design process; they enable further design detail by focusing on the big picture as a set of related scenarios accomplishing customer goals. For further reading on use cases, see Fast Track UML 2.0, by Kendall Scott (Apress, 2004) and Writing Effective Use Cases, by Alistair Cockburn (Addison-Wesley, 2001).

Once you ve closed the Add Table window, you can see the visual query designer show underneath. The two tables are represented as two small windows in the designer area. You can drag these windows around as you wish. You can also form a relationship between two columns by dragging a column and dropping it on another column in the other table. In the current example, you need to form an INNER JOIN relationship between the ParentProductID column of the ProductComponents table and the ID column of the Products table. Drag the ParentProductID column, and drop it on the ID column in the Products table. A link will instantly form between these two fields. This is shown in Figure 15-3. You can also see that the full SQL query is automatically regenerated each time you make any changes in the visual designer area. You can run the generated query by right-clicking the SQL query area and selecting the Execute SQL item (the one with the red exclamation point icon) in the ensuing pop-up menu.

All Help files consist of topics Each topic is a page with Help information that you view separately In HTML Help (the standard used in this chapter), each topic is analogous to a Web page and can contain arbitrary HTML, pictures, links to other topics, CSS (Cascading Style Sheets) styles, JavaScript (which can be used to great effect), and even ActiveX controls (although this isn t recommended) You can also refer to topics by a unique topic name or numeric ID This gives you the ability to launch a Help file and position it at a specific topic to give the user information that s relevant to the current window or task This is the basic tool for incorporating contextsensitive Help Essentially, a Help file is nothing more than a collection of topics.

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