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{ lblRendered.Text = DateTime.Now.ToLongTimeString(); } } This means that even though most of the markup for this page is pregenerated and cached in the memory of the web server, each request will have the most current date and time inserted where the Substitution element is declared. The extension to the output caching functionality provided by the post-cache substitution feature is a powerful facility that allows you to take a very fine grain of control over the performance of your pages. There s no reason you need to limit yourself to small pieces of markup when using this feature. Larger blocks of markup could be generated by the static method doing this work. Here s a sample method that s programmatically binding GridView and returning its rendered markup as a string. public static string GetData(HttpContext context) { GridView gv = new GridView(); DataTable dt = getAuthorsDataTable(); gv.DataSource = dt; gv.DataBind(); cn.Close(); StringBuilder sb = new StringBuilder(); HtmlTextWriter t = new HtmlTextWriter(new StringWriter(sb)); gv.RenderControl(t); return sb.ToString(); } Creatively combining output caching a post-cache substitution will be a technique you can leverage to super-charge the performance of your ASP .NET 2.0 web applications.

To avoid the hazards mentioned, force Visual Basic to require that you declare all variables before you use them. To do so, place the following line at the top of your code module: Option Explicit Alternatively, you can turn on explicit data type checking by choosing Tools Options and checking the Require Variable Declaration box, as shown in Figure 2-1.

The SortedBindingList class implements key collection and data binding interfaces: IList<T>, IBindingList, and IEnumerable<T>: public class SortedBindingList<T> : IList<T>, IBindingList, IEnumerable<T> { } Table 5-1 describes each interface. Table 5-1. Interfaces Implemented by SortedBindingList

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A popular use of categories is to hide portions of a class s interface, typically to discourage the use of methods designed for internal consumption. In Java, methods can be scoped as private or protected, making them inaccessible outside the class. In Objective-C, you can hide a set of methods in a category. Listing 5-7 shows how the internal methods of the Toaster class are isolated in the Private category.

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SERVICE-ORIENTED ARCHITECTURE (SOA) represents a new and evolving model for building distributed applications. Services are distributed components, which provide well-defined interfaces that process and deliver XML messages. A servicebased approach makes sense for building solutions that cross organizational, departmental, and corporate domain boundaries. A business with multiple systems and applications on different platforms can use SOA to build a loosely coupled integration solution that implements unified workflows. The concept of services is familiar to anyone who shops online at an eCommerce web site. Once you have placed your order, you have to supply your credit card information, which is typically authorized and charged by an outside service vendor. Once the order has been committed, the eCommerce company then coordinates with a shipping service vendor directly to deliver your purchase. ECommerce applications provide another perfect illustration of the need for a service-oriented architecture: If the credit card billing component is offline or unresponsive, then you do not want the sales order collection process to fail. Instead, you want the order collected and the billing operation to proceed at a later time. Figure 1-1 provides a conceptual workflow for an eCommerce business that uses multiple services to process orders.

Once again, we close the file when we re done working with it:

After verifying that this works, delete the testProperties function in ISModel.m and the test code you just added in RootViewController.m viewDidLoad.

Heavy concurrent access of a leaf block. Such access typically happens if concurrent inserts are made into a nonpartitioned table with a monotonically increasing sequence of primary or unique keys. Sequence-based values will be in a strict numeric order. Since primary or unique indexes are populated with these sequence values, recently generated values tend to be populated in the same leaf block. CBC latches protecting the hash chains of those buffers will be heavily accessed, leading to CBC latch contention. Heavily accessed small table. In a nested loops join method, if the inner row source is a small table, and if it is not indexed, then for every row from the outer row source, the inner row source will be accessed using a full table scan. The result can be much higher concurrent access to the few blocks used by that table, which in turn may lead to CBC latch contention for the latches protecting that small table s blocks. While some amount of buffer access is done under the protection of a

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