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Here s one final note about items in the DataSet class: They re disconnected and are not restricted to the fire hose mode of data access . You have complete random access to any table, any column, and/or any row in the DataSet . In fact, objects in the DataSet class are also smart enough to keep track of any data you change inside of them . You can flush the data back to the physical database by using the CommandBuilder to prepare the DataSet for an Update through the DataAdapter . A CommandBuilder constructs SQL statements on your behalf . This is useful for simple commands and provides a quick and convenient approach for updating a database through a DataAdapter . Given either an IDataReader or a DataSet, the data-bound controls automatically render themselves appropriately to show the control on the browser . Although you can always connect to the database and fetch the data manually through the standard connection/ command architecture, ASP .NET and Visual Studio support an even easier way to render data declarative data binding .

Region Behaviors The Prism Library introduces the concept of region behaviors These are pluggable components that give a region most of its functionality Region behaviors were introduced to support view discovery and region context (described later in this chapter), and to create an API that is consistent across both WPF and Silverlight Additionally, behaviors provide an effective way to extend a region s implementation A region behavior is a class that is attached to a region to give the region additional functionality This behavior stays attached to the region and remains active for the lifetime of the region For example, when an AutoPopulateRegionBehavior is attached to a region, it automatically instantiates and adds any ViewTypes that are registered for regions with that name For the lifetime of the region, it keeps monitoring the Region ViewRegistry for new registrations.

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You just saw how to access data in the raw using ADO .NET, so now look at an easier way . ASP .NET includes some new classes that hide the complexity of managing connections and of gathering data: They re the DataSource controls . DataSource controls abstract the entire connection and command mechanism so that all you need to do is decide on a data source, point the control to that data source, and provide an appropriate query . Visual Studio provides a wizard that guides you through this process . When you have a DataSource, you can attach it to a data-bound control that uses it . The following exercise shows how to make a query and populate controls with the results of the query .

. . 1 . . Add a new form to DataBindORama named DataBindingWithDB . 2 . . The example for this chapter (named DataBindORama), available on the accompanying CD, includes a SQL Server Express database named ASPNETStepByStep4 .mdf . First create an App_Data folder by right-clicking the Project node in Solution Explorer and clicking Add, Add ASP .NET Folder, App_Data . Add the database to your project by right-clicking the App_Data node in the project and clicking Add, Existing Item . Locate the ASPNETStepByStep4 .mdf file from the CD . Set up a data source control for the database . Go to the Data controls in the Toolbox . Drag a SqlDataSource onto the form . Click Configure Data Source on the context menu displayed by Visual Studio . You ll see a

Now you can call the Write method and pass in any parameter values you require. There are many overloads of the Write method. They allow you to specify the message text, the category, the priority (a numeric value), the event ID, the severity (a value from the TraceEventType enumeration), and a title for the event. There is also an overload that allows you to add custom values to the log entry by populating a Dictionary with name and value pairs (you will see this used in a later example). Our example code uses several of these overloads. We ve removed some of the Console.WriteLine statements from the code listed here to make it easier to see what it actually does.

combo box with a list of available databases; the new SQL Server database is the one that will appear, as shown in the following graphic . Click the ASPStepByStep4 .mdf file in the combo box to create a connection to the database . Click Next to move to the connection string wizard page . Click Next and accept the connection string that Visual Studio creates for you .

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