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Notice how this is an opt-in scheme. If you don t do anything to the contrary, you get the lowest sensible visibility. Your classes are visible to any code inside your assembly, but aren t accessible to anyone else; a class s properties and methods are only visible inside the class, unless you explicitly choose to make them more widely accessible. When different layers specify different protection, the effective accessibility is the lowest specified. For example, although our property has public accessibility, the class of which it is a member has internal accessibility. The lower of the two wins, so the Identifier property is, in practice, only accessible to code in the same assembly. It is a good practice to design your classes with the smallest possible public interface (part of something we sometimes call minimizing the surface area ). This makes it easier for clients to understand how they re supposed to be used and often cuts down on the amount of testing you need to do. Having a clean, simple public API can also improve the security characteristics of your class framework, because the larger and more complex the API gets, the harder it generally gets to spot all the possible lines of attack. That being said, there s a common misconception that accessibility modifiers secure your class, by preventing people from accessing private members. Hence this warning:

It is important to recognize that these protection levels are a convenient design constraint, to help us structure our applications properly. They are not a security feature. It s possible to use the reflection features described in 17 to circumvent these constraints and to access these supposedly hidden details.

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To finish this discussion, you should know that there are two other protection levels available to us protected and protected internal which we can use to expose (or hide) members to developers who derive new classes from our class without making the members visible to all. But since we won t be talking about derived classes until 4, we ll defer the discussion of these protection levels until then. We can take advantage of protection in our Plane class. A plane s identifier shouldn t change mid-flight, and it s a good practice for code to prevent things from happening that we know shouldn t happen. We should therefore add that constraint to our class. Fortunately, we have the ability to change the accessibility of the getter and the setter individually, as Example 3-5 shows. (This is one reason the property syntax makes use declare the get and set explicitly it gives us a place to put the protection level.)

class Plane { public string Identifier { get; private set; } }

10. Advanced exercise: Write an HTML filter that, given an arbitrary HTML document, produces an HTML document that will not result in the execution of script if loaded into a user s browser, but leaves basic markup (fonts, formatting, etc.) intact. Consider the possibility that the input document is not well-formed HTML, and also consider browser-specific features. Trade implementations with a fellow student or coworker and attack each other s solutions for example, try to find an input string such that the resulting document causes script of your choosing to execute if loaded into a browser. Resort to mean tricks, such as using CSS style sheets to cause script execution.

Compiling again, we get a new error message:

The property or indexer 'Plane.Identifier' cannot be used in this context because the set accessor is inaccessible

The problem is with this bit of code from Example 3-3:

someBoeing777.Identifier = "BA0049";

We re no longer able to set the property, because we ve made the setter private (which means that we can only set it from other members of our class). We wanted to prevent the property from changing, but we ve gone too far: we don t even have a way of giving it a value in the first place. Fortunately, there s a language feature that s perfect for this situation: a constructor.

ryptography is the study of how to mathematically encode and decode messages The objective of this chapter and the next is to show you how to use cryptography as a tool to achieve some of the security goals we discussed in 1 A cryptographic primitive is an algorithm that can be used to, for example, encode or decode a message In this chapter and the next, you ll see how to use cryptographic primitives to achieve authentication, confidentiality, and message integrity Our focus will be to show how cryptographic primitives can be used to achieve security goals That is, we will focus on applied cryptography, and how to put cryptographic primitives to practical use Using cryptographic primitives correctly is tricky business When used correctly, cryptographic primitives can help improve the security of a software application.

The <% and %> marks work just as they did in classic ASP, indicating that code falls between them (in this case, C#). The = sign immediately following the opening tag causes ASP.NET to evaluate the expression inside the tags and display the value. Run the page by pressing F5.

You can add server-side controls to a web form in three ways: by writing markup in the .aspx page, by dragging controls from the toolbox (to either the Source or Design view), or by writing code that adds them at runtime. For example, suppose you want to use radio buttons to let the user choose one of three shipping companies when placing an order. You can write the following HTML into the <form> element in the HTML window:

<asp:RadioButton GroupName="Shipper" id="Speedy" text="Speedy Express" Checked="True" runat="server"> </asp:RadioButton> <asp:RadioButton GroupName="Shipper" id="United" text="United Package" runat="server"> </asp:RadioButton> <asp:RadioButton GroupName="Shipper" id="Federal" text="Federal Shipping" runat="server"> </asp:RadioButton>

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