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One important detail to remember is that the user control s constituent controls can be accessed only by the user control. This means the web page that hosts the user control can receive the events, set the properties, or call the methods of these contained controls. For example, in the TimeDisplay user control the web page has no ability to access the LinkButton control that it uses. Usually, this behavior is exactly what you want. It means your user control can add public properties to expose specific details without giving the web page free rein to tamper with everything and potentially introduce invalid or inconsistent changes. For example, if you want to give the web page the ability to tweak the foreground color of the LinkButton control, you might add a ForeColor property to your user control. Here s an example: Public Property ForeColor() As Color Get Return lnkTime.ForeColor End Get Set lnkTime.ForeColor = Value End Set End Property To change the foreground color in your web-page code, you would now use code like this: TimeDisplay1.ForeColor = System.Drawing.Color.Green

At first glance, it might seem that ADONET offers a fragmented model, because it doesn t include a generic set of objects that can work with multiple types of databases As a result, if you change from one RDBMS to another, you ll need to modify your data access code to use a different set of classes But even though different NET data providers use different classes, all providers are standardized in the same way More specifically, each provider is based on the same set of interfaces and base classes For example, every Connection object implements the IDbConnection interface, which defines core methods such as Open() and Close() This standardization guarantees that every Connection class will work in the same way and expose the same set of core properties and methods Behind the scenes, different providers use completely different low-level calls and APIs.

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Figure 2-17. Collapsing code You can hide any section of code that you want. Simply select the code, right-click the selection, and choose Outlining Hide Selection.

This example maps the lnkTime.ForeColor property to the ForeColor property of the user control. This trick is usually the best approach, but it can become tedious if you need to expose a large number of properties. For example, your user control might render a table, and you might want to let the user configure the formatting of each table cell. In this case, it might make sense to expose the complete control object. Here s an example that exposes the lnkTime control for the TimeDisplay user control: Public ReadOnly Property InnerLink() As LinkButton Get Return lnkTime End Get End Property Notice that you need to use a read-only property, because it s not possible for the web page to replace the control with something different. Now this is how you would set the foreground color in the hosting page: TimeDisplay1.InnerLink.ForeColor = System.Drawing.Color.Green Keep in mind that when you use this practice, you expose all the details of the inner control. This means the web page can call methods and receive events from that control. This approach gives unlimited flexibility, but it reduces the reusability of the code. It also increases the chance that your web page will become tightly coupled to the internal details of the current implementation of your control, thereby making it less likely that you can revise or enhance the user control without disrupting the web pages that use it. As a general rule, it s always better to create dedicated methods, events, and properties to expose just the functionality you need, rather than opening a back door that could be used to create messy workarounds.

For example, the SQL Server provider uses the proprietary TDS (Tabular Data Stream) protocol to communicate with the server The benefits of this model aren t immediately obvious, but they are significant: Because each provider uses the same interfaces and base classes, you can still write generic data access code (with a little more effort) by coding against the interfaces instead of the provider classes You ll see this technique in action in the section Provider-Agnostic Code Because each provider is implemented separately, it can use proprietary optimizations (This is different from the ADO model, where every database call needs to filter through a common layer before it reaches the underlying database driver) In addition, custom providers can add nonstandard features that aren t included in other providers (such as SQL Server s ability to perform an XML query) ADONET also has another layer of standardization: the DataSet.

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