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In this chapter we provided a quick overview of the nature of the C# language, and we showed some of its strengths and how the latest version has evolved. There s one last benefit you should be aware of before we get into the details in the next chapter, and that s the sheer quantity of C# resources available on the Internet. When the .NET Framework first appeared, C# adoption took off much faster than the other .NET languages. Consequently, if you re searching for examples of how to get things done, or solutions to problems, C# is an excellent choice because it s so well represented in blogs, examples, tools, open source projects, and webcasts Microsoft s own documentation is pretty evenhanded between C# and VB.NET, but on the Web as a whole, you re far better served if you re a C# developer. So with that in mind, we ll now look at the fundamental elements of C# programs.

This demonstrates that there s clearly just the one piece of information here, no matter how many different object instances we may try to look at it through. But why might we want this kind of static, class-level data storage The principal use for class-level data is to enforce the reality that there is exactly one instance of some piece of data throughout the whole system. If you think about it, that s exactly what our miles-to-kilometers value is all about we only need one instance of that number for the whole system, so we declare it as const (which, as we ve already

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his chapter continues our discussion of cryptography by examining asymmetric key cryptography. In the previous chapter, we covered symmetric key cryptography. The problem with symmetric key cryptography is that any two parties that want to exchange confidential information with each other need to agree on a key beforehand. Alice needs to somehow tell Bob the key in order for him to decrypt a message that she sends him. Alice and Bob could meet in person to agree on a key but this is not usually possible in an Internet transaction. How should they agree upon a key For thousands of years, symmetric key cryptography was the only kind of cryptography that existed. In the 1970s, two scientists by the name of Diffie and Hellman came up with a new encryption method called asymmetric key cryptography, also sometimes referred to as public key encryption. Asymmetric key cryptography can help Alice and Bob communicate without having to meet a priori to agree upon a key.

seen, is like a special case of static). A similar pattern crops up in lots of places in the .NET Framework class library. For example, on a computer running Windows, there is a specific directory containing certain OS system files (typically C:\Windows \system32). The class library provides a class called Environment which offers, among other things, a SystemDirectory property that returns that location, and since there s only one such directory, this is a static property. Another common use for static is when we want to cache information that is expensive to calculate, or which is frequently reused by lots of different objects of the same type. To get a benefit when lots of objects use the common data, it needs to be available to all instances.

We can even apply the static keyword to a constructor. This lets us write a special constructor that only runs once for the whole class. We could add the constructor in Example 3-43 to our Plane class to illustrate this.

static Plane() { Console.WriteLine("Plane static constructor"); }

With this code in place, you would see the message printed out by that constructor just once at the beginning of the program static constructors run exactly once.

In case you re wondering, yes, static fields can be marked as readonly. And just as a normal readonly field can only be modified in a constructor, a static readonly field can only be modified in a static constructor.

Why do we need asymmetric key cryptography For example, if two people who do not know each other want to communicate privately on the Internet, it would be extremely inconvenient for them to have to meet in person or talk over the phone to agree upon a key Asymmetric key cryptography provides a way for them to do so without having to go to these lengths To illustrate how, we provide an example of a personal dating application in which users do not know each other beforehand, and would like to have private conversations with each other Let us consider a personal dating application with three users: Alice, Bob, and Carol Bob posts a personal ad Bob wants Alice and Carol to be able to send him personal messages, but he wants the contents of those messages to be confidential Bob is a two-timer.

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