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If you had to put another loop around the person loop, you would proceed in the same way. You don t need to follow the steps rigidly. The idea is to start with something concrete, worry about only one thing at a time, and build up the loop from simple components. Take small, understandable steps as you make the loop more general and complex. That way, you minimize the amount of code

public class Person { private int thePersonsAge; public void setAge(int p_age) { // Do some validation thePersonsAge = p_age; } public int getAge() { return thePersonsAge; } }

public sealed class Complex { public static Complex operator+(Complex c1, Complex c2) { ... } }

To understand what s happening, let s start by looking at the Plus method . This method has declared its parameter s type as dynamic, and inside the method, the argument is used as the two operands to the binary + operator . Since arg is dynamic, the C# compiler emits payload code that will examine the actual type of arg at runtime and determine what the + operator should actually do . The first time Plus is called, 5 (an Int32), is passed, so Plus will return the value 10 (also an Int32) back to its caller . This puts this result in the result variable (declared as a dynamic type) . Then, the M method is called, passing it result . For the call to M, the compiler will emit payload code that will, at runtime, examine the actual type of the value being passed to M and determine which overload of the M method to call . When result contains an Int32, the overload of M that takes an Int32 parameter is called .

All columns must have names. The column names must be unique. ORDER BY is not allowed (unless TOP is also speci ed).

Note the URL displayed in the address bar. The query string embeds in the ReturnUrl variable the originally requested page. Let s review the source code associated with the click event of the form button:

As you might have guessed, the UpdatePanel control relies heavily on these events. You can also use these events to cancel asynchronous postbacks, provide custom information or animation to the user when these events are fired, or simply run your code at specific times within the request.

As you can see, whenever region was NULL, the concatenated string became NULL . SQL Server cached the execution plan of the stored procedure for later reuse . Along with the plan, SQL Server also stored the state of all SET options that can affect query results . You can observe those in a bitmap called setopts in sys.syscacheobjects . Set the CONCAT_NULL_YIELDS_NULL option to OFF, telling SQL Server to treat a NULL in concatenation as an empty string:

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DateTimeList dtl = new DateTimeList();

the caller. Using SelectSingleNode perhaps results in a more easily readable code, but doing so certainly does not improve the performance of the application when you need just one node. In the next section, we'll build a sample Microsoft Windows Forms application to start practicing with XPath expressions, thus turning into concrete programming calls all that theory about the XPath query language. The Sample XPath Evaluator The sample XPath Evaluator application is a Windows Forms application that loads an XML document and then performs an XPath query on it. The application's user interface lets you type in both the context node and the query string. Next it creates an XML DOM for the document and calls SelectNodes. The output of the expression is rendered as an XML string rooted in an arbitrary <results> node, as shown here: <results> ... XML nodes that match ... </results> The sample application is shown in Figure 6-3. You can find the code listing for this application in this book's sample files.

This cut splits both the cake and the hole into equal halves. You get two pieces of the same size and the same amount of frosting.

This chapter covers joins and set operationstheir logical aspects as well as their physical/performance aspects. I'll demonstrate practical applications for each type of join and set operation. I have used the ANSI SQL terminology to categorize the elements of the language that I'll cover here. Joins (CROSS, INNER, OUTER) refer to horizontal operations (loosely speaking) between tables, while set operations (UNION, EXCEPT, INTERSECT) refer to vertical operations between tables.