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One of the key underlying ideas of the ADO.NET provider model is that it s extensible. In other words, developers can create their own providers for proprietary data sources. In fact, numerous proof-of-concepts examples are available that show how you can easily create custom ADO.NET providers to wrap nonrelational data stores, such as the file system or a directory service. Some third-party vendors also sell custom providers for .NET. The .NET Framework is bundled with a small set of four providers: SQL Server provider: Provides optimized access to a SQL Server database (version 7.0 or later). OLE DB provider: Provides access to any data source that has an OLE DB driver. This includes SQL Server databases prior to version 7.0. Oracle provider: Provides optimized access to an Oracle database (version 8i or later). ODBC provider: Provides access to any data source that has an ODBC driver. Figure 7-1 shows the layers of the ADO.NET provider model.

Url) End If End If End Sub Note that when you raise an event, you must first check to see if the event variable contains a null reference If it does, it signifies that no event handlers are registered yet (perhaps the control hasn t been created) Trying to fire the event at this point will generate a null reference exception If the event variable isn t Nothing, you can fire the event by using the name and passing along the appropriate event parameters Consuming this event isn t quite as easy as it is for the standard set of ASP NET controls The problem is that user controls don t provide much in the way of design-time support (Custom controls, which you ll look at in 27, do provide design-time support.

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As you program with Visual Studio, you ll become familiar with its many timesaving conveniences. The following sections outline the most important features you ll use (none of which is new in Visual Studio 2005).

) As a result, you can t use the Properties window to wire up the event handler at design time Instead, you need to write the event handler and the code that attaches it yourself Here s an example of an event handler that has the required signature (as defined by the LinkClickedEventHandler): Protected Sub LinkClicked(ByVal sender As Object, ByVal e As LinkTableEventArgs) lblInfoText = "You clicked '" & eSelectedItemText _ & "' but this page chose not to direct you to '" & eSelectedItemUrl & "'" eCancel = True End Sub You have two options to wire up the event handler You can do it manually in the PageLoad event handler using delegate code: AddHandler LinkTable1LinkClicked, AddressOf LinkClicked.

When choosing a provider, you should first try to find a native .NET provider that s customized for your data source. If you can t find a native provider, you can use the OLE DB provider, as long as you have an OLE DB driver for your data source. The OLE DB technology has been around for many years as part of ADO, so most data sources provide an OLE DB driver (including SQL Server, Oracle, Access, MySQL, and many more). In the rare situation when you can t find a dedicated .NET provider or an OLE DB driver, you can fall back on the ODBC provider, which works in conjunction with an ODBC driver.

Visual Studio does include one new IntelliSense feature XHTML (Extensible HTML) validation. You ll learn about this feature, and how to control the level of XHTML support you want, in 3.

Alternatively, you can do it in the control tag. Just add the prefix On in front of the event name, as shown here: <apress:LinkTable ID="LinkTable1" runat="server" OnLinkClicked="LinkClicked" /> Figure 14-5 shows the result when a link is clicked.

Microsoft includes the OLE DB provider with ADO.NET so that you can use your existing OLE DB drivers. Tip However, if you can find a provider that s customized specifically for your data source, you should use it instead. For example, you can connect to a SQL Server database using either the SQL Server provider or the OLE DB provider, but the SQL Server provider will always perform best.

Outlining allows Visual Studio to collapse a subroutine, block structure, or region to a single line. It allows you to see the code that interests you, while hiding unimportant code. To collapse a portion of code, click the minus box next to the first line. Click the box again (which will now have a plus symbol) to expand it (see Figure 2-17).

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