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To use a BackgroundWorker class object, you need to write the following event handlers. The first is required since it contains the code you want to be executed by the background thread, but the other two are optional, depending on the needs of your program. The handler attached to the DoWork event contains the code you want executed in the background on a separate thread. In Figure 22-2, this handler is named DoTheWork and is in a gradient-shaded box to illustrate that it s executed in the separate thread. The DoWork event is raised when the main thread calls the RunWorkerAsync method.

s Note Code generation is outside the scope of this book. For good information on code generation, including the rationale behind CriteriaBase, please refer to Kathleen Dollard s book, Code Generation in Microsoft .NET (Apress, 2004).

SmtpMail.SmtpServer = smtp_server; SmtpMail.Send(Message);

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/// <summary> /// returns the measured voltage in Volt of /// the specified ADC channel. /// </summary> public float this[AdcChannel channel] { get { return this.voltages[(int)channel]; } set { if (value < 0 || value >= this.supplyVoltage / 1000.0f) throw new ArgumentOutOfRangeException("value", value, null); this.voltages[(int)channel] = value; } } } } The SpiAdcConverterSampleEmulator emulator project implements a complete emulator that uses the component in Listing 13-28, and you can find it in this chapter s directory. With a track bar control, you can set the measurable voltage on the emulator s user interface. In Listing 13-29, you can see how to configure and register the component using XML. The component is registered with the ADC ID. With this ID, you can address and obtain the component with the emulator. Listing 13-29. Configuring the ADC Emulator Component Using XML < xml version="1.0" encoding="utf-8" > <Emulator> <Types> <ADC124S101>Kuehner.SPOT.Emulator.ADC124S101, SpiAdConverterSampleEmulator</ADC124S101> </Types> <EmulatorComponents> <ADC124S101 id="ADC"> <Pin>10</Pin> <! -chip select--> <SupplyVoltage>5000</SupplyVoltage> <!--SPI--> <ClockRateKHz>15000</ClockRateKHz> <ChipSelectActiveState>false</ChipSelectActiveState> <ChipSelectSetupTime>1</ChipSelectSetupTime> <ChipSelectHoldTime>1</ChipSelectHoldTime> <ClockIdleState>true</ClockIdleState> <ClockEdge>false</ClockEdge> <SpiModule>Spi1</SpiModule> </ADC124S101> </EmulatorComponents> </Emulator>

1. When we first installed a copy of the compiler on our system, we typed in a simple example and compiled it, and it came back fast so fast that we were convinced something was wrong and hunted down a developer for assistance. It s so much faster than C++ compilers are (or can be).

Caution A blank cell does not cause problems with grouping, but use the Delete key to remove the text.

Figure 9-2. An integer value is coerced into a string. A single expression can combine a few levels of coercion, as shown in Figure 9-3.

the constrained columns, and these columns are on the leading edge of the index, the constraint can and will use them.

Listing 3-4. The Interface Definition Class File for the RequestQuote Operation and Its Associated Types

You would expect the ReportItems collection to include all report items placed on the report (not just textboxes), but this is not the case. Why Because with version 1.0 of Reporting Services the report item properties can be changed only by expressions and the textbox values are read-only, there is really no good reason to do so. I hope the next version will enhance the object model to expose not only all report items but also their properties (in read-write mode) similar to the WinForm and ASP.NET object models. Even better, a future RS object model could support creating report items dynamically in code. This would make it possible to generate report sections conditionally. For instance, a Body_OnLoad event handler could check some business rules and generate different report regions based on the result, such as a chart or tabular region. For now, the best you can do is to hide a region pragmatically by using an expression. Implementing conditional formatting A common requirement is to add conditional formatting features to reports, where the visual appearance of report items (font, color, size, and so on) changes based on some runtime conditions. Consider an example to demonstrate how the ReportItems collection could be used to customize the appearance of textbox report items. Let s change the Employee Sales by Territory with Summary report to check whether the salesperson has exceeded a certain goal, e.g., $2,500,000. If she has exceeded her goal, the report will show an indicator and highlight the person s name EXPLORING THE REPORT OBJECT MODEL 151

public class Over { public void overrideMe() { } } class SubOver extends Over { @Override public void overrideme() { } }

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