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Implementing the IComparable interface allows strings to be used in all sorts of container classes where comparison is a requirement. For example, in 11, you ll see how to define a generic collection class that has a constraint indicating that any class used in the generic collection must implement IComparable. This allows the author of the generic class to assume certain functionality, such as the existence of the CompareTo method. The CompareTo method alone isn t rich enough to support all the factors that might be relevant in comparing strings in real-world code. Sometimes comparison must be case sensitive, other times comparison must be case insensitive. Additionally, comparison in some applications must be sensitive to culture, since alphabets and alphabetical order are dependent on locale. The CompareTo method also includes overloads that support comparison of substrings. There s also a CompareOrdinal method that is useful if the strings represent numbers and you want a comparison of the number.

Data validation is often used as part of building any Flex application in general, but is also an important step to creating a successful Mashup. You will often need to validate UI forms before sending the information through an RPC component.

The /etc/apt/sources.list file is at the heart of the APT system and contains details of all the package repositories you re subscribed to, as well as the individual categories within each repository. You can edit the file within vim by opening a terminal window (Applications Accessories Terminal) and typing the following:

The help system for SQL Server as a whole has been altered: you now have the ability to use not only the help installed on the computer, but also the online help; thus you have access to the most up-to-date information. Configure the help system through the Help node options shown in Figure 2-14.

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[_writeData replaceBytesInRange:NSMakeRange(0, bytesWritten) withBytes:NULL length:0]; } } } #define EAD_INPUT_BUFFER_SIZE 128 - (void)_readData { // // get appDelegate (pongAppDelegate) so we can reference its properties // appDelegate = (pongAppDelegate *)[[UIApplication sharedApplication] delegate]; uint8_t buf[EAD_INPUT_BUFFER_SIZE]; while ([[_session inputStream] hasBytesAvailable]) { NSInteger bytesRead = [[_session inputStream] read:buf maxLength:EAD_INPUT_BUFFER_SIZE]; NSLog(@"read %d bytes (%d) from input stream", bytesRead,buf[0]); // for now, we only expect two different command bytes from the accessory // 0x10 - means that the pushbutton was pressed and no additional data follows // 0x20 - means that the knob (potentiometer) has changed position and an // additional byte follows which represents the knob's position if (buf[0] == 0x10) { [[NSNotificationCenter defaultCenter] postNotificationName:@"PBPRESSED" object:self]; // no user data } if (buf[0] == 0x20) { //NSData *data = [[NSData alloc] initWithBytes:buf

This chapter looked at some simple interactive programming with F# and .NET. Along the way, you met many of the constructs you use in day-to-day F# programming. In the next chapter, you take a closer look at these and other constructs that are used to perform compositional and succinct functional programming in F#.

As explained earlier in the chapter, in order for your properties to allow data binding, template binding, styling, and so on, they must be dependency properties. In addition to the dependency properties, you added two callback methods that will be called when the properties are updated. By naming convention, the CoolDownSeconds property has a DependencyProperty object named CoolDownSecondsProperty and a callback method of onCoolDownSecondsPropertyChanged(). So you need to watch out, or your names will end up very long, as they have here. 3. Add some private members to contain state information, as follows: namespace CoolDownButton { public class CoolDownButtonControl : Control { private FrameworkElement corePart; private bool isPressed, isMouseOver, isCoolDown; private DateTime pressedTime; ... } }

You simply used a VB 9.0 Order By clause to sort rows by city:

For the purposes of explanation, imagine you have 4MB of build data that needs to be scattered into a hash table, but the hash_area_size has been set so that there are only nine blocks (72KB) available for building the hash table Oracle will (probably) pick a cluster size of one, and build a hash table of four partitions, nominally two clusters per partition, with one spare block left for I/O As each block in the hash table fills, it will be dumped to disk At the end of the build phase, there will be four build partitions on disk, each about 1MB in size, and Oracle will have tidied up its memory so that the only data left in memory will be a few blocks from the first build partition.

Figure 6-6. The XML message is displayed after invoking the web method. All right, now it s time to move on to our reporting project. Let s generate a report using the web service and consume it with the Windows Forms client.

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