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When you begin adding properties to a user control, it becomes more important to understand the sequence of events. Essentially, page initialization follows this order: 1. The page is requested. 2. The user control is created. If you have any default values for your variables, or if you perform any initialization in a class constructor, it s applied now. 3. If any properties are set in the user control tag, these are applied now. 4. The Page.Load event in the page executes, potentially initializing the user control. 5. The Page.Load event in the user control executes, potentially initializing the user control. Once you understand this sequence, you ll realize that you shouldn t perform user control initialization in the Page.Load event of the user control that might overwrite the settings specified by the client.

ASP .NET also gives you the ability to use a stylesheet as part of a theme. You might use this feature for a few reasons: You want to style HTML elements that might not correspond to server controls. You prefer to use a stylesheet because it is more standardized or because it can also be used to format static HTML pages. You have already invested effort in creating a stylesheet, and you don t want to create themes to implement the same formatting.

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ADO.NET has two types of objects: connection-based and content-based. Connection-based objects: These are the data provider objects such as Connection, Command, DataAdapter, and DataReader. They execute SQL statements, connect to a database, or fill a DataSet. The connection-based objects are specific to the type of data source. Content-based objects: These objects are really just packages for data. They include the DataSet, DataColumn, DataRow, DataRelation, and several others. They are completely independent of the type of data source and are found in the System.Data namespace. In the rest of this chapter, you ll learn about the first level of ADO.NET the connection-based objects, including Connection, Command, and DataReader. You won t learn about the higher-level DataAdapter yet, because the DataAdapter is designed for use with the DataSet and is discussed in 8. (Essentially, the DataAdapter is a group of related Command objects; these objects help you synchronize a DataSet with a data source.)

Many user controls are designed to abstract away the details of common scenarios with a higherlevel control model. For example, if you need to enter address information, you might group several text box controls into one higher-level AddressInput control. When you re modeling this sort of control, you ll need to use more complex data than individual strings and numbers. Often, you ll want to create custom classes designed expressly for communication between your web page and your user control. To demonstrate this idea, the next example develops a LinkTable control that renders a set of hyperlinks in a formatted table. Figure 14-4 shows the LinkTable control.

To use a stylesheet in a theme, you first need to add the stylesheet to your theme folder. ASP .NET searches this folder for all .vbs files and dynamically binds them to any page that uses the theme. This has one catch, however. To bind the page to the stylesheet, ASP.NET needs to be able to insert a <link> tag in the <head> section of the web page. This is possible only if the <head> tag has the runat="server" attribute. This turns the <head> element into a server-side control that ASP .NET can modify to insert the stylesheet links. <head runat="server"> <title>...</title> </head> Once this is in place, you simply need to set the Theme attribute of the page to gain access to the stylesheet rules. You can then set the CssClass property of the controls you want to format, as you saw earlier in the chapter. Any style rules that are linked directly to HTML tags are applied automatically. You can use as many stylesheets as you want in a theme. ASP.NET will add multiple <link> tags, one for each stylesheet in the theme. You can include more than one cascading stylesheet in a theme. If you add multiple cascading stylesheets, then the server-side <head runat="Server"/> tag will automatically generate links for each stylesheet.

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