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You need to explicitly build this functionality into the Shape class. The first step is to define a property that stores the numeric z-index value: private int zOrder; public int ZOrder { get { return zOrder; } set { zOrder = value; } } As with controls, the actual reordering is performed by the container, because it involves comparing the z-index of each item. In this case, it s the ShapeCollection class (described in the next section) that plays this role. To make the sorting process even easier, the Shape class implements the IComparable interface: public abstract class Shape : IComparable { ... } Now the Shape class needs to implement the CompareTo() method, which compares two shape objects and determines which one should occur first, which is important when hit-testing and drawing multiple shapes. The goal in this example is to make sure the shapes with the highest z-index occur first in the list. When implementing CompareTo(), you can return one of three values 0 to indicate two values are equal, -1 to indicate that the current instance is less than the instance supplied through the parameter, and 1 to indicate that the object supplied through the parameter is larger than the current instance. However, to make the code even shorter, you can implement it by invoking the CompareTo() method of the ZOrder property, because a basic implementation of CompareTo() is built into all integers. Here s the code to implement this behavior: public int CompareTo(object shape) { return ZOrder.CompareTo(((Shape)shape).ZOrder); } None of the code you ve seen so far actually calls the CompareTo() method. To fill in that detail, you need to build the ShapeCollection class that holds shape objects.

INSERT INTO Jobs@hq.com(JobID,JobName) VALUES('J01','New Hair clips series');

You could use the generic List<Type> class to create a collection for storing shapes without needing to create a new class. However, in this case creating a custom collection class makes sense because it gives you a good place to put code that works on groups of shapes (like hittesting and reordering).

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Don t let reactive attitudes tarnish your project team. Take up the fight from the start by including benchmark testing as an integral part of your development process. By harnessing the power of your benchmarking framework, you can predict problems well before they rear their ugly heads. Suppose early benchmark tests on your existing hardware have shown your e-commerce platform s performance will degrade rapidly once 50 concurrent users are consistently querying the database. Knowing that this limit will eventually be reached, you can run benchmarks against other hardware configurations or even different configurations of the MySQL server variables to determine if changes will make a substantial impact. You can then turn to the management team and show, certifiably, that without an expenditure of, say, $3,000 for new hardware, the web site will fall below the acceptable performance standards. The management team will appreciate your ability to solve performance problems before they occur and provide real test results as opposed to a guess.

There are several options for creating the custom shape collection. You could derive from List<Shape> to add your logic to the strongly typed List<Type> class, or you could derive from CollectionBase, which wraps an ArrayList and exposes it through your own strongly typed methods. The following example uses the ArrayList approach. public class ShapeCollection : CollectionBase { ... } The actual collection is stored internally as an ArrayList, but you need to add the strongly typed Add() and Remove() methods. When these methods are called, you access the internal ArrayList through one of two properties: List (which provides access to the collection through the IList interface) or InnerList (which provides the full ArrayList). Here are the strongly typed Remove() method and collection indexer: public void Remove(Shape shapeToRemove) { List.Remove(shapeToRemove); } public Shape this[int index] { get { return (Shape)this.List[index]; } } The Add() method is a little more interesting. It has the additional responsibility of making sure the new item has the lowest z-index so that it appears on top of all other shapes. public void Add(Shape shapeToAdd) { // Reorder the shapes so the new shape is on top. foreach (Shape shape in List) { shape.ZOrder++; } shapeToAdd.ZOrder = 0; List.Add(shapeToAdd); } The ShapeCollection class also provides BringShapeToFront() and SendShapeToBack() methods that allow the z-order of a shape to be changed relative to the rest of the collection: public void BringShapeToFront(Shape frontShape) { foreach (Shape shape in List) { shape.ZOrder++; } frontShape.ZOrder = 0; }

When testing application code, or configurations of hardware or software, always isolate the variable you wish to test This is an important scientific principle: in order to show a correlation between one variable and a test result, you must ensure that all other things remain equal You must ensure that the tests are run in an identical fashion, with no other changes to the test other than those tested for In real terms, this means that when you run a benchmark to test that your integer product key is faster than your character product key, the only difference between the two benchmarks should be the product table s key field data type.

INSERT INTO Announcements@abc.com(Description) VALUES('New hair clips arriving Dec 09'); INSERT INTO Products@acme.com(ProdID,Price) VALUES ('HClips01', '3.40'); COMMIT; The three tables exist in three different databases set up in the configuration shown in Figure 2-6.

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