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This line identifies the source file that contains the user control using the Src attribute. It also defines a tag prefix and tag name that will be used to declare a new control on the page. In the same way that ASP.NET server controls have the <asp: ... > prefix to declare the controls (for example, <asp:TextBox>), you can use your own tag prefixes to help distinguish the controls you ve created. This example uses a tag prefix of apress and a tag named Header. The full tag is shown in this page: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="HeaderTest.aspx.cs" Inherits="HeaderTest" %> <%@ Register TagPrefix="apress" TagName="Header" Src="Header.ascx" %> <html> <head> <title>HeaderHost</title> </head> <body> <form id="Form1" method="post" runat="server"> <apress:Header id="Header1" runat="server"></apress:Header> </form> </body> </html> At a bare minimum, when you add a user control to your page, you should give it a unique ID and indicate that it runs on the server, like all ASP .NET controls. Figure 14-1 shows the sample page with the custom header.

Figure 14-1. Testing the header user control In Visual Studio, you don t need to code the Register directive by hand. Instead, once you ve created your user control, simply select the .ascx in the Solution Explorer and drag it onto the drawing area of a web form. Visual Studio will automatically add the Register directive for you as well as an instance of the user control tag. The header control is the simplest possible user control example, but it can already provide some realistic benefits. Think about what might happen if you had to manually copy the header s HTML code into all your ASP.NET pages, and then you had to change the title, add a contact link, or something else. You would need to change and upload all the pages again. With a separate user control, you just update that one file. Best of all, you can use any combination of HTML, user controls, and server controls on an ASP.NET web form.

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The design-time support for user controls is greatly improved in ASP.NET 2.0. Now you can see a real representation of the user control at design time (rather than a blank gray box), and you can use the smart tag to quickly jump to the corresponding .ascx file. Best of all, when you add the user control to a web page, Visual Studio makes the corresponding user control object available to your code automatically, as you ll see in later examples.

This book uses generic names for provider-specific objects. In other words, instead of discussing the SqlConnection and OracleConnection objects, you ll learn about all connection objects. Just keep in mind that there really isn t a generic Connection object it s just convenient shorthand for referring to all the provider-specific connection objects, which work in a standardized fashion.

There s a lot going on here, but very little of it has anything to do with making an offer on a house. The vast majority of that code exists solely to manage all the different states the form could be in at any given time, and would have to be repeated every time a view uses a subclass, and that s not efficient.

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.

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.

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.

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