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15 continues your examination of .NET assemblies by checking out the process of runtime type discovery using the System.Reflection namespace. Using the types of this namespace, you can build applications that can read an assembly s metadata on the fly. You will also learn how to load and create types at runtime dynamically using late binding. The final topic of this chapter will explore the role of .NET attributes (both standard and custom). To illustrate the usefulness of each of these topics, the chapter shows you how to construct an extendable Windows Forms application.

Now that you have a solid understanding of assemblies, this chapter dives deeper into the composition of a loaded .NET executable. The goal of this chapter is to illustrate the relationship between processes, application domains, and contextual boundaries. These topics provide the proper foundation for 19, where you will examine the construction of multithreaded applications.

In more than one real project, I ve seen developers initially trust request validation, and release their application with no other protection. Later, a manager receives complaints from legitimate users who are unable to enter certain text with angle brackets. The manager is embarrassed and raises a bug. To fix

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The goal of this chapter is twofold. In the first half (more or less), you will examine the syntax and semantics of CIL in much greater detail than in previous chapters. The remainder of this chapter will cover the role of the System.Reflection.Emit namespace. You can use these types to build software that can generate .NET assemblies in memory at runtime. Formally speaking, assemblies defined and executed in memory are termed dynamic assemblies. You should not confuse this term with a dynamic type, which is the subject of 18.

.NET 4.0 introduces a new aspect of the .NET runtime environment called the dynamic language runtime. Using the DLR and the C# 2010 dynamic keyword, you can define data that is not truly resolved until runtime. Using these features simplifies some very complex .NET programming tasks dramatically. In this chapter, you will learn some practical uses of dynamic data, including how to leverage the .NET reflection APIs in a streamlined manner, as well as how to communicate with legacy COM libraries a minimum of fuss and bother.

the bug, a programmer has no choice but to disable request validation, either for one page or across the whole application. The programmer may not realize that his XSS-proof application is now laced with XSS vulnerabilities, or more likely he does realize it, but he s already moved on to a different project now and can t go back to deal with open-ended issues like this. And thus, the initial sense of security was false and counterproductive, and led to worse vulnerabilities in the long run.

After these small tweaks, our layout is looking nice and crisp, except for the margin between our columns and footer (Figure 14-15).

By this point in the text, you have a solid handle on the C# language and the details of the .NET assembly format. Part 5 leverages your newfound knowledge by exploring a number of commonly used services found within the base class libraries, including the creation of multithreaded application, file I/O, and database access using ADO.NET. This part also covers the construction of distributed applications using Windows Communication Foundation (WCF), workflow-enabled applications that use the Windows Workflow Foundation (WF) API and the LINQ to XML API.

Request validation is still enabled by default in ASP.NET MVC 2. Sometimes you may need to disable it to let users submit form values containing angle brackets or other perfectly legitimate character sequences that request validation would reject. If you want to disable it either for a specific action method or across a specific controller, you can use the [ValidateInput] filter, as follows: [ValidateInput(false)] public class MyController : Controller { ... }

Visual Studio 2010 ships with the expected GUI designers, code snippet support, database manipulation tools, object and project browsing utilities, and an integrated help system. Unlike many of the IDEs we have already examined, Visual Studio 2010 provides numerous additions. Here is a partial list. Visual XML editors/designers Support for Windows mobile device development Support for Microsoft Office development Designer support for Windows Workflow Foundation projects Integrated support for code refactoring Visual class designer tools

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