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increments the local variable that the condition relies on. Unlike a for loop, a do...while loop doesn t include initializer or iterator statements. Compiling and running Listing 4-8 produces the following |output: Iteration for value: 0 Iteration for value: 1 Iteration for value: 2 Iteration for value: 3 Iteration for value: 4 Press enter to finish

The final C# loop type is a while loop. Listing 4-9 contains an example. Listing 4-9. Using a while Loop using System; class Listing 08 { static void Main(string[] args) { int x = 0; while (x < 5) { // write out a message Console.WriteLine("Iteration for value: {0}", x); // increment the local variable x++; } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Figure 4-20 shows the while loop in Listing 4-9 .

14 17 10 10 10 10 8 8 3

Figure 4-20. The anatomy of a while loop A while loop will perform the statements in the code block while the condition evaluates to true. If the condition doesn t evaluate to true when first evaluated, the statements in the code block will never be performed; this is the key difference from the do...while loop, which will perform the statements at least once. In Listing 4-9, the code block includes a statement that increments the local variable that the condition relies on. Unlike a for loop, a while loop doesn t include initializer or iterator statements. Compiling and running Listing 4-9 produces the following output: Iteration for value: 0 Iteration for value: 1 Iteration for value: 2 Iteration for value: 3 Iteration for value: 4 Press enter to finish

100,000 30,000 $163,800,000

The following sections provide a brief description of all the keywords and operators that we will encounter as we explore C# in the coming chapters. Each item is described briefly, and details of where in the book you can find further information are provided. I have not listed all the keyword and operators just the ones that are commonly used and that are covered in this book. These sections are not intended to be read start to finish. I suggest you use these for reference when you know what it is you want to achieve but can t remember which keyword or operator you should use. Many of the keywords are accompanied by brief examples to jog your memory in just these circumstances. The keywords are grouped by category. Table 4-3 summarizes the keywords so you can turn find what you are looking for.

bool, byte, sbyte, char, class, decimal, double, float, delegate, dynamic, enum, interface, object, string, struct, short, ushort, int, uint, long, ulong, void, var public, protected, private, internal, abstract, const, event, in, out, override, readonly, sealed, static, virtual if, else, switch, case, default for, foreach, do, while break, continue, goto, return try, catch, finally checked, unchecked lock params, ref, out, in namespace, using null, true, false, default is, as, new, typeof from, where, select, group, into, orderby, join, let, ascending, descending, on, equals, by, in base, get, set, value, global, implicit, explicit, operator, partial, this, yield

24-1 through 24-4 24-5 24-6

24-7, 24-8 24-9

There are many different areas to explore what s new and different with JDBC 4.0. In addition to the new driver-loading capabilities, you ll discover many other features added to Mustang via JSR 221, many times to add support for new SQL 2003 features. According to the original Java Specification Request, one of the primary goals of the new release is ease of use. You be the judge on how well Sun did.

Increased sales Annual warehouse bene ts Annual warehouse costs Loss from warehouse $7,800,000 Pro t rate 30% Increased pro ts $2,340,000 ($3,500,000) ($1,160,000)

Read the value of the Status property or the value of one of the IsXXX properties. Use a CancellationTokenSource.

24-10

24-11 through 24-13 24-14 through 24-18

Deal with the exception in the Task body, catch the exception from a trigger member or implement a custom escalation property.

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Note The examples in this chapter are purposely just code snippets, not complete programs. This was

24-19 through 24-22 24-23

Create a chain of Tasks which will executed selectively. Create a critical region. Use collections without encountering race conditions.