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APPEnDix Creative Commons Legal Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 331 inDEx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

A static constructor can be used to initialize static properties and fields. You do not need to call a static constructor the .NET runtime does this automatically for you. Static fields and properties are shared between all instances of a class, so a static constructor is called only the first time that the enclosing class is used in an application domain (and since most programs have only one application domain, this means that constructors are called only once each time a program is run). Listing 9-53 demonstrates a class with a static constructor.

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Physically securing your system and laying down good policies for employees and users is often just as important as using the technological security mechanisms that we cover in this book. All of your servers should be behind locked doors, and only a privileged set of employees (typically system and security administrators) should have access to them. In addition, data centers used to house farms of servers can employ cameras, card reader and biometric locks, and even vaults of various kinds, depending upon the sensitivity of data stored on the servers. In addition to mechanisms that limit access to a physical space to prevent asset theft and unauthorized entry, there are also mechanisms that protect against information leakage and document theft. Documents containing sensitive information can be shredded before they re disposed of so that determined hackers can be prevented from gathering sensitive information by sifting through the company s garbage. Such an attack is often referred to as dumpster diving.

Listing 9-53. Using a Static Constructor using System; class Calculator { public static int Multiplier; static Calculator() { Console.WriteLine("Static constructor called"); Multiplier = 2; } public Calculator() { Console.WriteLine("Instance constructor called"); } public int PerformCalculation(int x, int y) { return x * y * Multiplier; } } class Listing 53 { static void Main(string[] args) { // create 5 instances of Calculator for (int i = 0; i < 5; i++) { Calculator calc = new Calculator(); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The static constructor in Listing 9-53 is shown in bold. Static constructors are modified with the static keyword and have no parameters. Classes can have only one static constructor. The Main method in Listing 9-53 creates five instances of the Calculator class. Compiling and running the code in Listing 9-53 produces the following results: Static constructor called Instance constructor called Instance constructor called Instance constructor called Instance constructor called Instance constructor called Press enter to finish

You can see from the results that the static constructor is called only once. Static constructors can only use static fields and properties in the containing class and call static methods, although you can create instances of other classes and assign these to static fields and properties. You don t have to call the base static constructor from a derived class. The static constructors are all executed automatically. The code statements in a static constructor are executed when a static member is called. This includes static methods, meaning that the static constructor is called before the code statements in a Main method; see The Main Method section earlier in the chapter for details of this special method.

Foreword xv About the Authors xvii About the Technical Reviewers xix About the Foreword Writer xxi Introduction xxiii.

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