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Button MyButton = new Button(); MyButtonText = "Press Here"; MyButtonLocation = new Point(100, 200);

Set the version number of the MyPhotoAlbum library to 5.4. HANDLE THE BITMAP EXCEPTION Action 1 In the Photograph.cs file, create a private static member to hold a Bitmap object. Add a public property to retrieve this bitmap.

Mike Kimbell, an EV consultant, said it best: Below 30 mph you could put an electric motor on a brick and never notice the difference The reason is simple: aerodynamic drag force varies with the square of the speed If you re not moving, there s no drag at all Once you get rolling it builds up rapidly and soon swamps all other factors Let s see exactly how The aerodynamic drag force can be expressed as Fd 5 (CdAV2)/391 where Fd is the aerodynamic drag force in lbs, Cd is the coefficient of drag of your vehicle, A is its frontal area in square feet, and V is the vehicle speed in mph To minimize drag for any given speed you must minimize Cd, the coefficient of drag, and A, its frontal area

After you have created a button, you must add it to a form You do this by calling the Add( ) method on the collection of controls linked to that form This collection is available through

private static Bitmap _invalidImageBitmap = null;

26:

the Controls property, which is inherited from the Control class The Add( ) method is defined like this: public virtual void Add(Control cntl) Here, cntl is the control being added Once a control has been added to a form, it will be displayed when the form is displayed

public static Bitmap InvalidPhotoImage { get { if (_invalidImageBitmap == null) { // Create the "bad photo" bitmap Bitmap bm = new Bitmap(100, 100); Graphics g = Graphics.FromImage(bm); g.Clear(Color.WhiteSmoke); // Draw a red X Pen p = new Pen(Color.Red, 5); g.DrawLine(p, 0, 0, 100, 100); g.DrawLine(p, 100, 0, 0, 100); _invalidImageBitmap = bm; } return _invalidImageBitmap; } }

The following program adds a button to the skeleton shown earlier At this time, the button does not do anything, but it is present in the form and can be clicked

public Bitmap Image { get { if (_bitmap == null) { try { _bitmap = new Bitmap(_fileName); } catch { _bitmap = InvalidPhotoImage; } } return _bitmap; } } public bool IsImageValid { get { return (_bitmap != InvalidPhotoImage); } }

// Add a Button using System; using SystemWindowsForms; using SystemDrawing; class ButtonForm : Form { Button MyButton; public ButtonForm() { Text = "Using a Button"; MyButton = new Button(); MyButtonText = "Press Here"; MyButtonLocation = new Point(100, 200); ControlsAdd(MyButton); } [STAThread] static void Main() { ButtonForm skel = new ButtonForm(); ApplicationEnableVisualStyles(); ApplicationRun(skel); } }

This program creates a class called ButtonForm, which is derived from Form It contains a Button field called MyButton Inside the constructor, the button is created, initialized, and added to the form When run, the program displays the window shown in Figure 26-2 You can click the button, but nothing will happen To make the button do something, you must add a message handler, as described in the next section

There is quite a bit of new code here (at least, by our standards in this chapter), so let s take a look at some of the more important pieces. First, look at the InvalidPhotoImage property. 152

In order for a program to respond to a button press (or any other type of control interaction), it must handle the message that the button generates In general, when a user interacts with a control, those interactions are passed to your program as messages In a form-based C# program, these messages are processed by event handlers Therefore, to receive messages,

public static Bitmap InvalidImageBitmap { get { if (_invalidImageBitmap == null) { // Create the "bad photo" bitmap Bitmap bm = new Bitmap(100, 100); Graphics g = Graphics.FromImage(bm); g.Clear(Color.WhiteSmoke); Pen p = new Pen(Color.Red, 5); g.DrawLine(p, 0, 0, 100, 100); g.DrawLine(p, 100, 0, 0, 100); _invalidImageBitmap = bm; } return _invalidImageBitmap; } }

Part II: