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Next, another lambda expression based handler is added to kvetKeyPress by the following code It counts the number of keypresses

Notice that count is a local variable declared in Main( ) that is initialized to zero Next, a loop is started that calls kevtOnKeyPress( ) when a key is pressed This causes the registered event handlers to be notified When the loop ends, the number of keypresses is displayed Although quite simple, this example illustrates the essence of event handling The same basic approach will be used for other event handling situations Of course, in some cases, anonymous event handlers will not be appropriate and named methods will need to be employed

his chapter discusses three C# features that give you greater control over the organization and accessibility of a program These are namespaces, the preprocessor, and assemblies

Therefore x = 1/ 2 and y = 1/ 2 It follows that sin = y = 1 2 ,

The namespace was mentioned briefly in 2 because it is a concept fundamental to C# In fact, every C# program makes use of a namespace in one way or another We didn t need to examine namespaces in detail before now because C# automatically provides a default, global namespace for your program Thus, the programs in earlier chapters simply used the global namespace In the real world, however, many programs will need to create their own namespaces or interact with other namespaces Here, they are examined in detail A namespace defines a declarative region that provides a way to keep one set of names separate from another In essence, names declared in one namespace will not conflict with the same names declared in another The namespace used by the NET Framework library (which is the C# library) is System This is why you have included

using System;

near the top of every program As explained in 14, the I/O classes are defined within a namespace subordinate to System called SystemIO There are many other namespaces subordinate to System that hold other parts of the C# library Namespaces are important because there has been an explosion of variable, method, property, and class names over the past few years These include library routines, thirdparty code, and your own code Without namespaces, all of these names would compete for slots in the global namespace and conflicts would arise For example, if your program defined a class called Finder, it could conflict with another class called Finder supplied by a third-party library that your program uses Fortunately, namespaces prevent this type of problem because a namespace restricts the visibility of names declared within it

Many organizations use press releases to announce events, performances, mergers and acquisitions, promotions, and other positive business developments They can also be used effectively to announce bad news Jim, CEO of an auto parts manufacturer, used a press release to announce a downturn in sales, for example I met with all employees in person, of course But using a press release allowed us to control how the news was positioned to the public I used the Diplomatic No organizational structure and it worked well Don t get me wrong: Bad news is bad news, but it could have been much worse if our stockholders, vendors, and customers heard rumors before we d made the announcement The introductory sentence in Jim s press release was in the third person and used the passive voice, usually a style to be avoided But in this case it resulted in a rational, calm tone that was necessary to avoid rumors It began:

Similar calculations allow us to complete the following table for the values of the trigonometric functions at the principal angles which are multiples of /6 or /4

Part I:

A namespace is declared using the namespace keyword The general form of namespace is shown here: namespace name { // members } Here, name is the name of the namespace A namespace declaration defines a scope Anything declared immediately inside the namespace is in scope throughout the namespace Within a namespace, you can declare classes, structures, delegates, enumerations, interfaces, or another namespace Here is an example of a namespace that creates a namespace called Counter It localizes the name used to implement a simple countdown counter class called CountDown