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} } With this update, you could now place a Car object into the Garage object as so: static void Main(string[] args) { Console.WriteLine("***** Fun with Automatic Properties *****\n"); // Make a car. Car c = new Car(); c.PetName = "Frank"; c.Speed = 55; c.Color = "Red"; c.DisplayStats(); // Put car in the garage. Garage g = new Garage(); g.MyAuto = c; Console.WriteLine("Number of Cars in garage: {0}", g.NumberOfCars); Console.WriteLine("Your car is named: {0}", g.MyAuto.PetName); Console.ReadLine(); } As you most likely agree, this is a very nice feature of the C# programming language, as you can define a number of properties for a class using a streamlined syntax. Be aware of course that if you are building a property that requires additional code beyond getting and setting the underlying private field (such as data validation logic, writing to an event log, communicating with a database, etc.), you will be required to define a normal .NET property type by hand. C# automatic properties never do more than provide simple encapsulation for an underlying piece of (compiler generated) private data.

The choice of Apache prefork vs. worker translates into whether to use multiple Apache child processes or fewer child processes, each with multiple threads. Generally for Drupal, the better choice is Apache prefork. Here s why: PHP is not thread-safe, so if you re using mod_php, then your only real choice is Apache prefork. If you re using Fastcgi (such as mod_fastcgi or mod_fcgid), then you could use Apache MPM worker because PHP requests would be handled externally from Apache. However, using Apache MPM worker instead of Apache MPM prefork is still not the big win that some make it out to be because there s nothing magical about threads that makes a multithreaded application automatically faster and more scalable than a preforked multiprocess equivalent, even on multi-core systems, and this is for a few reasons: First, it helps to demystify what threads really are to a Linux operating system: threads are mostly the same as child processes. What distinguishes a thread from a child process is that a thread has direct shared access to the memory contents of its parent process, whereas a forked child process gets a copyon-write reference to the memory contents of its parent process. This distinction offers a slight

As seen throughout this chapter, a constructor allows you specify start up values when creating a new object. On a related note, properties allow you to get and set underlying data in a safe manner. When you are working with other people s classes, including the classes found within the .NET base class library, it is not too uncommon to discover that there is not a single constructor which allows you to set every piece of underlying state data. Given this point, a programmer is typically forced to pick the best constructor possible, after which he or she makes assignments using a handful of provided properties. To help streamline the process of getting an object up and running, C# offers object initializer syntax. Using this technique, it is possible to create a new object variable and assign a slew of properties and/or public fields in a few lines of code. Syntactically, an object initializer consists of a comma delimited list of specified values, enclosed by the { and } tokens. Each member in the initialization list maps to the name of a public field or public property of the object being initialized.

To see this syntax in action, create a new Console Application named ObjectInitializers. Now, consider a simple class named Point, created using automatic properties (which is not mandatory for this example, but helps us write some very concise code):