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The last button control you ll consider here is an all-purpose rollover button. With the rollover button, very little work is performed with GDI+. Instead, button images for all the four states are prepared in a separate program, and imported into the application as resources. These images are then assigned to the control, which switches between them seamlessly. To implement the rollover button, you need to begin by defining the image properties. To save space, the following code shows only the image property for the initial, normal-state image. (The other image properties are almost identical.) public class RolloverButton : AnimatedButtonBase { private Image normalImage; private Image mouseOverImage; private Image pushedImage; private Image disabledImage; public Image NormalImage { get { return normalImage; } set { normalImage = value; // Just perform this tweak the first time the image is set // at design time. if (normalImage != null && DesignMode) { Size = new Size( normalImage.Size.Width + 10, normalImage.Size.Height + 2); } Invalidate(); } } ... One interesting detail is that the button automatically adjusts its size when you set the NormalImage property, which saves the hassle of resizing each button in the design environment. You also may want to set the background to transparent, so that any region that extends beyond the dimensions of the button picture shows the form background. Now, all the RolloverButton needs to do is to copy its images to the drawing surface in the appropriate paint methods. Here s an example that draws the normal state image:

InnoDB operates, by default, in the REPEATABLE READ isolation mode. This means that all transactions are guaranteed to be free of dirty reads and nonrepeatable reads. InnoDB s next-key-locking technique prevents phantom reads; however, a SERIALIZABLE isolation level is offered just in case. InnoDB differs from other database vendors in its default isolation level and its supported isolation levels. You should be aware of some of the differences, in case you routinely deal with other database vendors: Microsoft SQL Server operates in READ COMMITTED mode, by default, and supports all ANSI standard isolation levels. Oracle also operates in READ COMMITTED mode by default, but does not support REPEATABLE READ or READ UNCOMMITTED. A SERIALIZABLE mode is supported, as well as a READ ONLY nonstandard mode. PostgreSQL operates in REPEATABLE READ mode by default and supports only the additional SERIALIZABLE mode.

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... protected override void PaintNormal(Graphics g) { if (normalImage != null) g.DrawImageUnscaled(normalImage, new Point(0,0)); } ... However, a good rollover button doesn t force you to supply every picture. Instead, it s clever enough to substitute one picture for another if needed, or possibly even create a selected or disabled image by manipulating the color of the normal image. The RolloverButton is relatively simple in this regard it paints disabled images using the ControlPaint class if no disabled image is supplied, tries to substitute the mouse-over image if the pressed image is missing, and so on. ... protected override void PaintMouseOver(Graphics g) { if (mouseOverImage != null) { g.DrawImageUnscaled(mouseOverImage, new Point(0,0)); } else if (normalImage != null) { // If there is no mouse-over image, fall back on the // normal image (if it exists). g.DrawImageUnscaled(normalImage, new Point(0,0)); } } protected override void PaintPushed(Graphics g) { // Try pushed, mouse-over, and normal images, in // that order of preference. if (pushedImage != null) { g.DrawImageUnscaled(pushedImage, new Point(0,0)); } else if (mouseOverImage != null) { g.DrawImageUnscaled(mouseOverImage, new Point(0,0)); } else if (normalImage != null) { g.DrawImageUnscaled(normalImage, new Point(0,0)); } }

If you are an ASP.NET developer working with the SQL Server database, at one point or another you would definitely have come across a feature in Visual Studio that allows you to generate an ASP.NET GridView by specifying a SQL Server based data source. Visual Studio will generate the code to bind your grid to the DataAdapter and Command objects of the data source. When you install ODT.NET, this feature will also work together with the ODP.NET provider. What this means is that you will be able to easily generate ASP.NET GridView objects (via a few clicks) by specifying an Oracle-based data source. In this section, we will create a simple application to demonstrate this. Start by creating a new ASP.NET web application. Drag a GridView control to the default web page. Click the little arrow in the top-right corner of this control, and choose to create a new data source, as shown in Figure 15-31.

protected override void PaintDisabled(Graphics g) { if (disabledImage != null) { g.DrawImageUnscaled(disabledImage, new Point(0,0)); } else { if (normalImage != null) { // Fake a disabled image. // Serveral techniques are possible, but this is the easiest. ControlPaint.DrawImageDisabled(g, normalImage, 0, 0, BackColor); } } } } Figure 23-9 shows a skinned form with several rollover buttons.

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