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The final step of the OnPaint() drawing method is to call a method named PaintFocusRectangle(), provided the button is focused and not disabled. At this point, the focus cue is drawn around the borders of the control, provided the PaintFocusCue property is true. (If it s false, the PaintFocusRectangle() method isn t called at all.) private bool paintFocusCue = true; public bool PaintFocusCue { get { return paintFocusCue; } set { if (value != paintFocusCue) { paintFocusCue = value; Invalidate(); } } } protected virtual void PaintFocusRectangle(Graphics g) { ControlPaint.DrawFocusRectangle(g, this.ClientRectangle); }

Figure 15-27. Creating a data source from the OVERSEAS_JOBS table Now, add a new form to your project. Drag the Overseas_Jobs data source from the Data Sources window into the form (as you ve done earlier in this chapter). This will generate the data grid and all the accompanying controls, as shown in Figure 15-28.

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Notice that the PaintFocusRectangle() is marked virtual, which means the deriving class can override it with a different implementation if the ordinary dotted square isn t enough. Finally, the control needs to listen for focus events and update itself accordingly: protected override void OnGotFocus(EventArgs e) { if (paintFocusCue) Invalidate(); } protected override void OnLostFocus(EventArgs e) { if (paintFocusCue) Invalidate(); } These methods simply trigger a refresh of the complete button, but in most cases you could create a Graphics object for the control using Control.CreateGraphics(), and then call PaintFocusRectangle() to add this detail on top of the current drawing. This completes all the code you need to build the AnimatedButtonBase. In the next sections, you ll see how easy it is to build on this model to design your own animated buttons. You ll see three examples: A simple button that glows when it s highlighted. A more advanced button that includes a clickable picture region, which becomes raised when the mouse moves over it. A rollover button that swaps pictures when the mouse hovers over it.

The next isolation level, READ COMMITTED, eliminates the possibility of dirty reads by ensuring that other transactions cannot view the results of changes made during a transaction until the transaction processing system has committed the entire transaction. This ensures that dirty

Figure 15-28. The generated UI for the Overseas_Jobs data source Now, if you were to run this form, you can see that it will list the three records you ve inserted earlier, as shown in Figure 15-29. Notice however, that the PERSON_IN_CHARGE column shows nothing! This is because the generated UDT class does not have a ToString() method defined yet, so it is unable to represent the UDT class as a string (which is needed to display an object in a grid).

The first example you ll see demonstrates how easy it is to extend the AnimatedButtonBase class. The SimpleGlowButton creates a couple of drawing objects in its constructor, and simply overrides the four paint methods to paint a button with a different background color. Here s the complete code: public class SimpleGlowButton : AnimatedButtonBase { private Pen penOutline; private StringFormat textFormat; public SimpleGlowButton() { // In a more sophisticated details, these hard-coded // details would be mapped to properties. penOutline = new Pen(Color.Black, 2); penOutline.Alignment = PenAlignment.Inset; textFormat = new StringFormat(); textFormat.Alignment = StringAlignment.Center; textFormat.LineAlignment = StringAlignment.Center; }

reads are not possible. However, at this isolation level, another anomaly is possible: a nonrepeatable read, which is a phenomenon where a transaction may read data from a resource that may not be available, or may be a different value, after a concurrently executing transaction commits. This is also known as an inconsistent read. For instance, let s say transaction A starts and begins a modification on the customers table. Before the transaction commits, transaction B starts and reads a record from the customers table for customer ID 1002. The data returned by this statement may be modified or deleted by statements executing under transaction A. This means that if transaction B relies on the data read from the customers table during its own execution, it may be relying on a read request that could not be repeated once transaction A commits.

protected override void PaintNormal(Graphics g) { g.FillRectangle(Brushes.LightGray, ClientRectangle); g.DrawRectangle(penOutline, ClientRectangle); g.DrawString(Text, Font, Brushes.Black, ClientRectangle, textFormat); } protected override void PaintMouseOver(Graphics g) { g.FillRectangle(Brushes.LimeGreen, ClientRectangle); g.DrawRectangle(penOutline, ClientRectangle); g.DrawString(Text, Font, Brushes.White, ClientRectangle, textFormat); } protected override void PaintPushed(Graphics g) { g.FillRectangle(Brushes.Lime, ClientRectangle); g.DrawRectangle(penOutline, ClientRectangle); g.DrawString(Text, Font, Brushes.White, ClientRectangle, textFormat); } protected override void PaintDisabled(Graphics g) { g.FillRectangle(Brushes.LightSlateGray, ClientRectangle); g.DrawRectangle(penOutline, ClientRectangle); g.DrawString(Text, Font, Brushes.White, ClientRectangle, textFormat); } } Figure 23-7 shows the result.

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