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Another example of an application that could have a security vulnerability is a web browser. Web browsers download and interpret data from web sites on the Internet. Sometimes web browsers do not interpret data in a robust fashion, and can be directed to download data from malicious web sites. A malicious web site can make available a file that exploits a vulnerability in web browser code that can give the attacker control of the machine that the web browser is running on. As a result of poor coding, web browser code needs to be regularly patched to eliminate such vulnerabilities, such as buffer overflows (as discussed in 6). The creators of the web browser can issue patches that can be installed to eliminate the vulnerabilities in the web browser. A patch is an updated version of the software. The patch does not have to consist of an entirely updated version, but may contain only components that have been fixed to eliminate security-related bugs.

A question remains, though: where did the Where and Select methods here come from GetAllFilesInDirectory returns an IEnumerable<string>, and if you examine this interface (which we showed in the preceding chapter) you ll see that it doesn t define a Where method. And yet if you try these method-based equivalents of the query expressions, you ll find that they compile just fine as long as you have a using System.Linq; directive at the top of the file, and a project reference to the System.Core library. What s going on The answer is that Where and Select in these examples are extension methods.

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The distribution of types across DLLs in the class library is driven by a combination of efficiency requirements and history. The System.Core library is a good example of the latter. There is no System.Core namespace this library defines types in numerous namespaces including System, System.IO, and System.Threading. But you ll also find types in these same three namespaces in the System library and also a library called mscorlib. (All .NET programs have a reference to mscorlib, and since it s mandatory, Visual Studio doesn t show it in the Solution Explorer. It s where critical types such as System.String and System.Int32 are defined.) One of the reasons System.Core exists as a separate DLL is that it first appeared in version 3.5 of .NET. With versions 3.0 and 3.5 of .NET, Microsoft chose to put completely new functionality into new DLLs rather than altering the DLLs that were provided in version 2.0. This packaging decision choosing which types go in which DLLs was independent from the conceptual decision of which types belong in which namespaces. History doesn t explain the whole story, though. Even the very first version of .NET split its namespaces across multiple libraries. One common reason for this was to avoid loading code that is never used. You wouldn t want a desktop application to waste time and memory by loading the libraries for building web applications. In some cases,

namespaces are actually a pretty good guide to partitioning chances are good that if you use one type from one of the System.Web namespaces, you re going to be using lots of them. But there are a few cases in which namespaces are not the best way to determine packaging. For example, the System.Printing namespace is split across two libraries: the System.Printing library contains general print-related classes, but the ReachFrame work library adds extra types to the namespace that you may need if you re working with a particular kind of printable document called an XPS file. If you re not using that feature, you don t need a reference to that specialized DLL. This raises a question: how do you know where to find things It s frustrating when adding a reference to the System.Printing library fails to give you access to the types in the System.Printing namespace that you were looking for. Fortunately, the help pages for each type tell you both the namespace and the library file (assembly) containing the type.

The upshot is that the C# compiler cannot work out which libraries you want from your using directives, because in general it s not possible to deduce which libraries are required from the namespaces alone. So a project needs to list which libraries it uses, and then individual source files in that project can declare which namespaces they are using. Visual Studio provides you with a set of references that it hopes will be useful, and for this very simple example, we re not actually using most of them.

Visual Studio notices when your code doesn t use all of the libraries your project references, and automatically omits references to any unused libraries. This makes your binary slightly smaller than it would be if unnecessary references were left in.

The attacker can easily cause script to execute if he can manipulate the source of a <script> or <style> tag (as we will discuss in Section 10.5.5, CSS style sheets can cause script to execute). Take the following example: <script src="%(script_url)s"> If the attacker can make script_url point to http://hackerhome.org/evil.js, his malicious script will execute in the context of the page containing this script tag.

If you place the cursor between of the block elements and insert another less-than symbol (<), another element, providerName, will be suggested. If you haven t entered all of the required elements specified in the schema, the editor will let you know with wavy blue lines under the tags (see Figure 9-28).

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