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One of the traits that distinguishes any great programming environment is a well thought out object model. It s difficult to work with a patchwork of poorly designed objects and continue to create world-class software. Given a good object model, you can easily extend it with your own code. The underlying support for the object model of the .NET Framework is the type system the framework offers. Let me clarify a few terms here. When I talk about the type of a variable, I m talking about what the variable is designed to hold. For example, if a variable is an integer type, you wouldn t expect that setting it equal to dog or Fred would work. Likewise, if the type were a date type, 7/24/1956 would be a reasonable value, but 7 wouldn t be. Classic Active Server Pages (ASP) programmers are used to a development language that doesn t use variables with types. More accurately, every variable is a single type: Variant. Thus, a variable can hold 7 in one line and Fred in the next. Many beginning programmers find having a single data type convenient, but more experienced programmers realize the mess that this limitation can cause. Although forcing you to explicitly change variables from one type to another can be more work, it does ensure that you re converting a variable in a way you intended. Figure 3-1 shows the relationship between the various types the .NET Framework supports. Some of the types are probably familiar to you, and some refer to concepts that might be new to you, such as boxing and value types vs. reference types. I ll explain the new concepts associated with .NET Framework types as they come up in this chapter.

This is just a skeletal implementation of a type handler; in the following sections we ll flesh it out.

The scalar subquery in bold is in charge of returning the maximum order ID. This subquery is self-contained, meaning that it has no dependency on the outer query. A subquery that has a dependency on the outer query is known as a correlated subquery. For example, the following query returns the order with the maximum order ID for each customer:

Summary

In addition to the normal Image control, ASP .NET includes an ImageButton control and an ImageMap control . The ImageButton control wraps the <input type=image /> tag so that you can use an image as the background of a button . The ImageMap control shows a bitmap with hot spots on it that users can click . The following exercise illustrates how the various ASP .NET image-based controls work .

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-(void)setMusic:(id)sender { NSUserDefaults *myDefaults = [NSUserDefaults standardUserDefaults]; UISwitch *musicSwitch = [switchList objectAtIndex:1]; [myDefaults setBool:musicSwitch.on forKey:@"musicValue"]; [NSUserDefaults resetStandardUserDefaults]; } -(void)setSounds:(id)sender { NSUserDefaults *myDefaults = [NSUserDefaults standardUserDefaults]; UISwitch *soundsSwitch = [switchList objectAtIndex:0]; [myDefaults setBool:soundsSwitch.on forKey:@"soundsValue"]; [NSUserDefaults resetStandardUserDefaults]; }

Page 158 Step-by-Step: Configuring a Video Device with WDM Drivers 1. On the Capture Video, Audio, or Still Images page of the Capture Wizard, select one of the following capture options that lets you capture video from an attached recording or video capture device, and then click Next: Narrate slides with video and audio Video with audio Still images from video 2. If you chose to capture video, choose the capture setting for the video content you want to capture, and then click Next. The Choose Capture Devices page, shown in Figure 8.11, appears.

USE tempdb; IF OBJECT_ID('dbo.Employees', 'U') IS NOT NULL CREATE TABLE dbo.Employees ( empid VARCHAR(10) NOT NULL, salary MONEY NOT NULL, filler CHAR(2500) NOT NULL DEFAULT('a') ); CREATE CLUSTERED INDEX idx_cl_salary ON dbo.Employees(salary); ALTER TABLE dbo.Employees ADD CONSTRAINT PK_Employees PRIMARY KEY NONCLUSTERED(empid); INSERT INTO dbo.Employees(empid, salary) VALUES ('D', 1000.00),('A', 2000.00),('C', 3000.00),('B', 4000.00);

Fowler, Martin. Refactoring: Improving the Design of Existing Code, Reading, Mass.: Addison Wesley, 1999. In the description of the refactoring called Replace Nested Conditional with Guard Clauses, Fowler suggests using multiple return statements from a routine to reduce nesting in a set of if statements. Fowler argues that multiple returns are an appropriate means of achieving greater clarity, and that no harm arises from having multiple returns from a routine.

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