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Beyond these points, the Car type has a few properties to represent the current speed and a user supplied pet name, as well as various constructors to set the state of a new Car object. Here is the complete definition (with code annotations): class Car { // Constant for maximum speed. public const int MaxSpeed = 100; // Car properties. public int CurrentSpeed {get; set;} public string PetName {get; set;} // Is the car still operational private bool carIsDead; // A car has-a radio. private Radio theMusicBox = new Radio(); // Constructors. public Car() {} public Car(string name, int speed) { CurrentSpeed = speed; PetName = name; } public void CrankTunes(bool state) { // Delegate request to inner object. theMusicBox.TurnOn(state); } // See if Car has overheated. public void Accelerate(int delta) { if (carIsDead) Console.WriteLine("{0} is out of order...", PetName); else { CurrentSpeed += delta; if (CurrentSpeed > MaxSpeed) { Console.WriteLine("{0} has overheated!", PetName); CurrentSpeed = 0; carIsDead = true; } else Console.WriteLine("=> CurrentSpeed = {0}", CurrentSpeed); } } }

Now, if we implement a Main() method that forces a Car object to exceed the predefined maximum speed (set to 100, in the Car class) as shown here: static void Main(string[] args) { Console.WriteLine("***** Simple Exception Example *****"); Console.WriteLine("=> Creating a car and stepping on it!"); Car myCar = new Car("Zippy", 20); myCar.CrankTunes(true); for (int i = 0; i < 10; i++) myCar.Accelerate(10); Console.ReadLine(); } we would see the following output: ***** Simple Exception Example ***** => Creating a car and stepping on it! Jamming... => CurrentSpeed = 30 => CurrentSpeed = 40 => CurrentSpeed = 50 => CurrentSpeed = 60 => CurrentSpeed = 70 => CurrentSpeed = 80 => CurrentSpeed = 90 => CurrentSpeed = 100 Zippy has overheated! Zippy is out of order...

<br /><br /> <%# Eval("Notes") %> <br /><br /> </small> </ItemTemplate> </asp:FormView> Figure 10-19 shows the result.

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Console.WriteLine(); // Convert r into a Square, // based on the height of the Rectangle. Square s = (Square)r; Console.WriteLine(s.ToString()); s.Draw(); Console.ReadLine(); } The output can be seen in Figure 12-3.

If you want to support editing, you need to add button controls that trigger the Edit and Update process, as described in the section Editing with a Template in the GridView section.

Figure 12-3. Converting a Rectangle structure to a Square structure While it may not be all that helpful to convert a Rectangle into a Square within the same scope, assume you have a function that has been designed to take Square parameters. // This method requires a Square type. static void DrawSquare(Square sq) { Console.WriteLine(sq.ToString()); sq.Draw(); } Using your explicit conversion operation on the Square type, you can now pass in Rectangle types for processing using an explicit cast: static void Main(string[] args) { ... // Convert Rectangle to Square to invoke method. Rectangle rect = new Rectangle(10, 5); DrawSquare((Square)rect); Console.ReadLine(); }

In the following sections, you ll consider a few ways to extend the GridView. You ll learn how to show summaries, create a complete master-details report on a single page, and display image data that s drawn from a database. You ll also see an example that uses advanced concurrency handling to warn the user about potential conflicts when updating a record.

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