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ADONET 20 provides support for a few features that are limited to SQL Server 2005 These features include the following: MARS (multiple active result sets): This allows you to have more than one query on the go at the same time For example, you could query a list of customers and then query a list of orders without closing the first query This technique is occasionally useful, but it s better if you can avoid the extra overhead User-defined data types: Using NET code, you can define a custom class and then store instances of that class directly in a column of the database This saves you the work of examining several fields in a row and then manually creating a corresponding data object to use in your application.

Another powerful technique is to reuse images by making them part of your theme. For example, imagine you perfect an image that you want to use for OK buttons throughout your website and you have another image for all the cancel buttons. The first step in implementing this design is to add the images to your theme folder. For the best organization, it makes sense to create one or more subfolders just for holding images. In Figure 15-7, the images are stored in a folder named ButtonImages.

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In the hosting page, you have two choices. You can set the Format property at some point in your code by manipulating the control object, as shown here: TimeDisplay1.Format = "dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)"; Your second option is to configure the user control when it s first initialized by setting the value in the control tag, as shown here: <apress:TimeDisplay id="TimeDisplay1" Format="dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)" runat="server" /> <hr /> <apress:TimeDisplay id="TimeDisplay2" runat="server" /> In this example, two versions of the TimeDisplay control are created, one with a control that displays the date in the default format and another one with a custom format applied. Figure 14-3 shows the resulting page on the browser.

Managed stored procedures: SQL Server 2005 can host the CLR, which gives you the ability to write stored procedures in the database using pure C# code SQL notifications: Notifications allow your code to respond when specific changes are made in a database In ASPNET, this feature is most commonly used to invalidate a cached data object when one or more records are updated This is the only SQL Server 2005 feature that s also supported in SQL Server 7 and SQL Server 2000, albeit through a different mechanism Snapshot transaction isolation: This is a new transaction level that allows you to improve concurrency It allows transactions to see a slightly older version of data while it s being updated by another transaction For the most part, this book concentrates on programming techniques that work with all relational databases.

Now you need to create the skins that use these images. In this case, both of these tags should be named skins. That s because you re defining a specific type of standardized button that should be available to the page when needed. You aren t defining a default style that should apply to all buttons. <asp:ImageButton runat="server" SkinID="OKButton" ImageUrl="ButtonImages/buttonOK.jpg" /> <asp:ImageButton runat="server" SkinID="CancelButton" ImageUrl="ButtonImages/buttonCancel.jpg" /> When you add a reference to an image in a skin file, always make sure the image URL is relative to the theme folder, not the folder where the page is stored. When this theme is applied to a control, ASP .NET automatically inserts the Themes\ThemeName portion at the beginning of the URL. Now to apply these images, simply create an ImageButton in your web page that references the corresponding skin name: <asp:ImageButton ID="ImageButton1" runat="server" SkinID="OKButton" /> <asp:ImageButton ID="ImageButton2" runat="server" SkinID="CancelButton" /> You can use the same technique to create skins for other controls that use images. For example, you can standardize the node pictures used in a TreeView, the bullet image used for the BulletList control, or the icons used in a DataGridView.

If you use simple property types such as int, DateTime, float, and so on, you can still set them with string values when declaring the control on the host page. ASP.NET will automatically convert the string to the property type defined in the class. Technically, ASP.NET employs a type converter a special type of object often used to convert data types to and from string representations, which is described in 28.

However, 11 covers SQL notifications because they are of great use in many ASPNET applications, and they are also supported in earlier versions of SQL Server through a different technology This chapter briefly covers snapshot isolation For information about other features that are specific to SQL Server 2005, you may want to consult A First Look at Microsoft SQL Server 2005 for Developers (Addison-Wesley, 2004) and Pro SQL Server 2005 Assemblies (Apress, 2005)..

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