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Events are raised when a specific property of an object changes. Although objects can raise several events, we ll discuss only a few, because all can be handled in the same fashion. You ll use the System.Data.SqlClient .NET data provider, but all data providers handle events in a similar way.

Figure 1-2. The XML document-processing model Common XML processors include Microsoft XML Parser (MSXML), Apache Xerces2, and the Oracle XML parser. You can write an application that uses any of these parsers. Some XML parsers are also available as prepackaged software that install automatically. Extensible Stylesheet Language Transformations (XSLT) processors used to display XML in a web browser fall into this category. MSXML contains both an XML parser and an XSLT processor, and is both an XML processor and an application. It installs automatically with Internet Explorer and other Microsoft software.

The connection object has two events: StateChange and InfoMessage. Let s look at these in more detail.

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The connection object raises the StateChange event when the state of the connection changes. The event handler receives a StateChangeEventArgs object, which you can examine for detailed information about the event. For example, it has OriginalState and CurrentState properties that you can access to determine the state of a connection before and after it changes.

There are two categories of XML processing: tree-based and event-based. Many XML parsers, including later versions of MSXML, support both models. You ll often hear tree-based parsers referred to as Document Object Model (DOM) parsers, while event-based parsers are referred to as Simple API for XML (SAX) parsers. Both are named after the specifications they support. The DOM is a W3C recommendation that provides an application programming interface (API) to an XML document. Any application can use this API to manipulate an XML document, read information, add new nodes, and edit the existing content. You can find out more about this recommendation at http://www.w3.org/TR/REC-DOM-Level-1/. SAX is not a W3C recommendation, but it does enjoy support from both large and small software companies. A SAX-based parser reads an XML document sequentially, firing off events as it reaches important parts of the document, such as the start or end of an element. You can find out more at http://www.saxproject.org/.

Figure 3-41. Opening the generated SQL script file in SQL Server Management Studio When the Open File dialog box appears, browse to the C:\LunchCounter folder and select the SandwichLanguage.sql. To open it, either double-click the file or click the Open button. This will display the contents of the T-SQL script file. Click the Execute button on the SSMS toolbar, as shown in Figure 3-42.

You ll now see how this event is handled. You ll open a connection to the Northwind database, retrieve one row from the Customers table, and close the connection. You ll write an event handler to notify you when the connection state changes. 1. In VBE, create a new Windows Application project named 15. When Solution Explorer opens, save the solution. 2. Rename the 15 project AdoNetEvents. Change the Text property of Form1 to ADO.NET Events. 3. Add four buttons, a label, and a list box to the form, as in Figure 15-1.

4. Add an Imports statement to Form1.vb for the System.Data.SqlClient namespace. 5. Add the following declaration to the Form1 class:

Figure 1-3 shows the dvd.xml document that you ve been working with represented as a tree structure.

Listing 15-1. Button1_Click()

An alternative approach to deploying the database is to use the mx.exe command-line utility. Figure 3-43 displays the syntax for using the mx.exe tool to deploy to the database, along with the output generated.

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