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Tip You can prefix a keyword with the @ symbol to make an identifier for example, @class. I recommend that you do not use this feature, because it tends to cause confusion, and there are an almost infinite number of less troublesome identifiers available for use.

Sometimes, applications don t want to expose an editable object. Many applications have objects that are read-only or display-only. Read-only objects need to support object persistence only for retrieving data, not for updating data. Also, they don t need to support any of the n-level undo or other editing-type behaviors, because they re created with read-only properties. For editable objects, there s BusinessBase, which has a property that can be set to indicate whether it s a parent or child object. The same base supports both types of objects, allowing dynamic switching between parent and child at runtime. Making an object read-only or read-write is a bigger decision, because it impacts the interface of the object. A read-only object should only include read-only properties as part of its interface, and that isn t something you can toggle on or off at runtime. By implementing a specific base class for read-only objects, they can be more specialized, and have less overhead. The ReadOnlyBase class is used to create read-only objects, as follows: [Serializable()] public class StaticContent : ReadOnlyBase<StaticContent> { } Classes shouldn t implement any read-write properties. Were they to do so, it would be entirely up to the code in the object to handle any undo, persistence, or other features for dealing with the changed data. If an object has editable properties, it should subclass from BusinessBase.

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4. From Database Explorer, drag the Customers table onto the edit window. You ll see the screen in Figure 18-17. Notice that the CustomerID column is marked as the primary key (with a key icon). You now have a typed dataset with one table in it.

A thread is the part of the .NET Framework that performs the statements in your code. By default, the .NET Framework creates one thread to execute your C# programs. This thread starts its work by executing the first statement in your Main method. When that statement has been executed, it moves on to the next line of code and executes that and then the next and the next. When these statements call other methods or methods in other objects, the thread doggedly executes the code statements that have been called before returning to the Main method and carrying on as before. The job of the thread is to execute every statement it encounters in sequence until the final statement of your Main method has been executed and your program can finish. You don t have to do anything to create the main thread; it is done for you by the .NET framework. This model of programming is sometimes called sequential execution or sequential programming because each code statement is executed strictly in sequence. It is also called single-threaded execution because there is one thread doing all the work. The advantage of sequential programming is that it is familiar and predictable. It is the technique used by 95% of programmers to solve 95% of programming problems. Listing 24-1 contains a simple example of a sequential program. Listing 24-1. Sequential Execution using System; using System.Diagnostics; class Listing 01 { static void Main(string[] args) { // create and start a new StopWatch Stopwatch timer = Stopwatch.StartNew(); // add up all the positive values that int can represent long posTotal = 0; for (int i = 0; i < int.MaxValue; i++) { posTotal += i; }

ScriptManager (Continued)

We are going to reuse the SessionPortlet class from 4 for our XDoclet example. None of the Java code in the portlet needs to be modified for XDoclet support; we only have to add the XDoclet portlet tags to the class. The first XDoclet tag we will use for SessionPortlet will be @portlet.portlet. This tag represents one portlet class in the portlet application. There are four parameters on the @portlet.portlet tag: description, display-name, expiration-cache, and name. These parameters correspond to several of the child elements of the

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