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If a column (in a specific row of a table) contains no value, we say that such a column contains a null value. The term null value is actually slightly misleading, because it is an indicator of missing information. Null marker would have been a better term, because a null value is not a value. There can be many different reasons for missing information. Sometimes, an attribute is inapplicable; for example, only sales representatives are eligible for commission. An attribute value can also be unknown; for example, the person entering data did not know certain values when the data was entered. And, sometimes, you don t know whether an attribute is applicable or inapplicable; for example, if you don t know the job of a specific employee, you don t know whether a commission value is applicable. The REGISTRATIONS table provides another good example. A null value in the EVALUATION column can mean several things: the course did not yet take place, the attendee had no opinion, the attendee refused to provide her opinion, the evaluation forms are not yet processed, and so on. It would be nice if you could represent the reason why information is missing, but SQL supports only one null value, and according to Ted Codd s rule 3 (see 1) null values can have only one context-independent meaning.

A try block contains code that requires common cleanup or exception recovery operations. The cleanup code should be placed in a single finally block. A try block can also contain code that might potentially throw an exception. The exception recovery code should be placed in one or more catch blocks. You create one catch block for each kind of event you think the application can recover from. A try block must be associated with at least one catch or finally block; it makes no sense to have a try block that stands by itself.

public void WriteXml(String) public void WriteXml(String, XmlWriteMode)

user s state informa tion. For more informa tion about this topic, see the sidebar ASP.N ET Forms vs. Visual Basic 6.0 Forms, earlier in this chapter . Wow. That s a lot of code! Not surprisingly, the C# script block at the top of Listing 5-1 isn t present in Listing 5-2, since it is identified as a runat=server script block. However, there is a new <SCRIPT> block, as follows: <script language="javascript" src="/aspnet_client/system_web/1_0_3217_0/WebUIValidation.js"> </script> This code, of course, doesn t look even a little familiar! Looking at the Internet Information Services console, we can see that, sure enough, a directory is logically located where the src attribute on the <SCRIPT> tag points to, as shown in Figure 5-5.

The old saying A picture is worth a thousand words is definitely true when it comes to understanding the distribution of spatial data. We added the map to Shake to present earthquake data graphically, giving a quick glance as to where earthquakes had occurred and how big they were. Our goal when creating the map view to Shake was twofold: provide a map that displays something useful and show you the basic idea behind creating your own widget. The result of this goal is the MapItemWidget, a simple class that draws markers of different sizes on a Mercator projection of Earth. The MapItemWidget gets its data from a model, so it additionally shows you how to watch a model s data for changes and rerenders when those changes occur. Listing 5 14 shows the class declaration for the MapItemWidget.

A synchronized (thread-safe) implementation of a concrete collection can be obtained by calling the Synchronized method, which returns a wrapped version of the collection, just like calling java.util.Collections.synchronizedCollection. This wrapped version is thread safe and can be used by concurrent writers. In addition, the ICollection interface provides a method to determine whether a collection is synchronized, and it provides an object that can be used for locking when writing thread-safe wrappers or using monitors.

specifies that the generated assemblies are strongly named by using a key file or key container to encode the assemblies and to ensure that they have not been tampered with. After you select this check box, you can do the following:

For each such period, you need to return the starting date, ending date, duration in days, and the peak (maximum) price. Let s start with a solution that does not use row numbers. The rst step here is to lter only the rows where the price is greater than or equal to 50. Unlike the traditional problem where you really have gaps in the data, here the gaps appear only after ltering. The whole sequence still appears in the Stocks table. You can use this fact to your advantage. Of course, you could take the long route of calculating the maximum date within the group (the rst date that is both later than or equal to the current date and followed by a gap). However, a much simpler and faster technique to calculate the grouping factor would be to return the rst date that is greater than the current, on which the stock s price is less than 50. Here, you still get the same grouping factor for all elements of the same target group, yet you need only one nesting level of subqueries instead of two. Here s the query: