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The while looping construct is useful should you wish to execute a block of statements until some terminating condition has been reached. Within the scope of a while loop, you will, of course, need to ensure this terminating event is indeed established; otherwise, you will be stuck in an endless loop. In the following example, the message In while loop will be continuously printed until the user terminates the loop by entering yes at the command prompt: static void Main(string[] args) { string userIsDone = "no"; // Test on a lower class copy of the string. while(userIsDone.ToLower() != "yes") { Console.Write("Are you done [yes] [no]: "); userIsDone = Console.ReadLine(); Console.WriteLine("In while loop"); } } Closely related to the while loop is the do/while statement. Like a simple while loop, do/while is used when you need to perform some action for an undetermined number of times. The difference is that do/while loops are guaranteed to execute the corresponding block of code at least once (in contrast, it is possible that a simple while loop may never execute if the terminating condition is false from the onset). static void Main(string[] args) { string userIsDone = ""; do

<li>Parmesan</li> <li>Swiss</li> </ul> So, when dealing with div, span, and the class attribute, be sure you aren t using them instead of more appropriate (X)HTML elements, and be sure you are using as few of them as possible. They re useful when used properly, but they can clutter up your document and cause a great deal of confusion if you re not careful.

{ Console.WriteLine("In do/while loop"); Console.Write("Are you done [yes] [no]: "); userIsDone = Console.ReadLine(); }while(userIsDone.ToLower() != "yes"); // Note the semicolon! }

Figure 6-24. PivotStyleLight1 formatting applied Comment out the first line of code in the ApplyTableStyle procedure and uncomment the second line. Run the subroutine from the Macros dialog box to apply PivotStyleLight22 formatting, as shown in Figure 6-25.

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Now that you can iterate over a block of statements, the next related concept is how to control the flow of program execution. C# defines two simple constructs to alter the flow of your program, based on various contingencies: The if/else statement The switch statement

First up is our good friend the if/else statement. Unlike in C and C++, however, the if/else statement in C# operates only on Boolean expressions, not ad hoc values such as 1, 0. Given this, if/else statements typically involve the use of the C# operators shown in Table 3-6 in order to obtain a literal Boolean value. Table 3-6. C# Relational and Equality Operators

HTML isn't the only game in town when it comes to web markup. XHTML has hit the ground running and is now very popular among many web designers and developers. Even after you choose one of the two, you ll still have to decide exactly which version you intend to write against. There are several factors to consider, and it s important to think them through and choose the right markup language for your project changing down the road may prove tedious and time consuming.

if(age == 30) if("Foo" != myStr) if(bonus if(bonus if(bonus if(bonus < 2000) > 2000) <= 2000) >= 2000)

Returns true only if each expression is the same Returns true only if each expression is different Returns true if expression A is less than, greater than, less than or equal to, or greater than or equal to expression B

Comment out the second line of code in the ApplyTableStyle procedure and uncomment the third line. Run the subroutine from the Macros dialog box to apply PivotStyleMedium23 formatting, as shown in Figure 6-26.

Again, C and C++ programmers need to be aware that the old tricks of testing a condition for a value not equal to zero will not work in C#. Let s say you want to see if the string you are working with is longer than zero characters. You may be tempted to write // This is illegal, given that Length returns an int, not a bool. string thoughtOfTheDay = "You CAN teach an old dog new tricks"; if(thoughtOfTheDay.Length) { ... } If you wish to make use of the String.Length property to determine if you have an empty string, you need to modify your conditional expression as follows:

IE-specific style sheet after your primary style sheet, you can simply send alternate values and properties to IE without using any hacks! If you haven t already, you ll want to dog-ear this page, because it s important. For example, to send alternate styles to IE 6 and earlier, in a separate style sheet a portion of your document s <head> might look like this: <link rel="stylesheet" type="text/css" href="c/styles.css" media="screen" /> <!--[if lte IE 6]> <link rel="stylesheet" type="text/css" href="c/IEbugs.css" media="screen" /> <![endif]--> Non-IE browsers will only load styles.css, but IE versions less than or equal to 6 will also load IEbugs.css, and apply those rules after the rules from the first style sheet, thus overriding specified values for any duplicate selectors.

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