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To be completely honest, Visual Studio 2010 provides so many features that it would take an entire book (a rather large book at that) to fully describe every aspect of the IDE. This is not that book. However, I do want to point out some of the major features in the pages that follow. As you progress through the text, you ll learn more about the Visual Studio 2010 IDE where appropriate.

Note In ASP.NET MVC, you can t disable request validation globally by using Web.config, as you can in Web Forms by setting <pages validateRequest="false">. That setting is ignored. However, you can disable it globally in your controller factory by assigning false to the ValidateRequest property on each controller as you create it.

If you are following along, create a new C# Console Application (named Vs2010Example) using the File New Project menu item. As you can see in Figure 2-9, Visual Studio 2010 supports the ability to select which version of the .NET Framework you wish to build against (2.0, 3.x, or 4.0) using the dropdown list box on the top center of the New Project dialog box. For each project in this text, you can simply leave the default selection of .NET Framework 4.0.

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The Solution Explorer utility (accessible from the View menu) allows you to view the set of all content files and referenced assemblies that comprise the current project (see Figure 2-10).

Figure 14-15. Almost there... Removing the margins from our paragraphs has brought the footer right up to the bottom of our longest column (experiment with different amounts of content in each column the result is the same on all three). It takes only a few seconds to discover that adding margin-top to the #footer rule doesn t change anything, so instead we ll add margin-bottom:.5em to the wrapper div surrounding columns one and two, and to column three (.third-col), which puts some distance between the columns and the footer (Figure 14-16).

Unfortunately, to confuse matters further, [ValidateInput] and the ValidateRequest property have no effect on .NET 4 unless you also make a further configuration change. To successfully disable request validation, you must add the following to your Web.config file: <configuration> <system.web> <httpRuntime requestValidationMode="2.0"/> </system.web> </configuration> This is because the request processing pipeline was changed in .NET 4, and request validation by default now happens too early for ASP.NET MVC to turn it off. There s no such problem in .NET 3.5. You can make up your own mind about how the benefits of request validation weigh against its dangers. However, you must not trust request validation to provide sufficient protection alone. It is still essential that you HTML-encode any untrusted user input for the reasons described previously. And if you do HTML-encode untrusted input (e.g., using <%: ... %> syntax in all cases), then request validation adds no further protection, but it can still inconvenience legitimate users.

Figure 2-10. The Solution Explorer utility Notice that the References folder of Solution Explorer displays a list of each assembly you have currently referenced, which will differ based on the type of project you select and the version of the Framework you are compiling against.

When you need to reference additional assemblies, right-click the References folder and select Add Reference. At this point, you can select your assembly from the resulting dialog box (this is essentially the way Visual Studio allows you to specify the /reference option of the command-line compiler). The .NET tab (see Figure 2-11) displays a number of commonly used .NET assemblies; however, the Browse tab allows you to navigate to any .NET assembly on your hard drive. Also, the very useful Recent tab keeps a running tally of frequently referenced assemblies you have used in other projects.

If you re using .NET 4, request validation is more flexible you can customize its logic however you wish by implementing your own request validator class. To do this, create a class that inherits from System.Web.Util.RequestValidator and override its IsValidRequestString() method. For example, here s a custom request validator that sets up an explicit whitelist of inputs that are allowed to skip validation. For any input not on the whitelist, request validation applies as normal.

Finally, notice an icon named Properties within Solution Explorer. When you double-click this item, you are presented with a sophisticated project configuration editor (see Figure 2-12).

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