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Again, we ve ended up doing extra work just to satisfy the C# type system, which is the opposite of what you d usually expect in the dynamic idiom types are supposed to matter less.

This is exactly the sort of problem you ll run into if you attempt to treat C# as a dynamic programming language the underlying issue here is that dynamic was designed to solve specific interop problems. It does that job very well, but C# as a whole is not really at home in the dynamic style. So it s not a good idea to attempt to make heavy use of that style in your C# code.

Summary

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HTTP by itself is a stateless protocol that is, successive HTTP requests initiated by the same user with the same browser a priori appear to the server as completely independent requests without any particular correspondence Web applications whose behavior depends on which user a particular request is associated with use one of several techniques to determine this association We described these techniques in 7, and we summarize them here: HTTP authentication: The HTTP protocol defines mechanisms by which the browser requests authentication credentials (username and password) from the user and then automatically supplies these credentials in a special HTTP header along with each request to the server (Franks et al 1999) Cookie authentication: A second commonly used HTTP request authentication scheme is based on HTTP cookies (Kristol and Montulli 2000) Here, the application requests the user s authentication credentials in an HTML form.

C# 4.0 s new dynamic keyword makes it much easier to use objects that were designed to be used from dynamic programming languages. In particular, COM automation APIs such as those offered by the Microsoft Office suite are far more natural to use than they have been in previous versions of the language. Interoperating with browser script objects in Silverlight is also easier than before.

Programmers love a clean slate. The thought of throwing away all the code we ve ever written and starting over can seem alluring, but this typically isn t a viable option for most companies. Many development organizations have made a substantial investment in developing and purchasing COM components and ActiveX controls. Microsoft has made a commitment to ensure that these legacy components are usable from within .NET applications, and (perhaps less important) that .NET components are easily callable from COM. The ability to mix managed .NET code with unmanaged code from the older worlds of Win32 and COM is called interoperability, or as it s usually abbreviated, interop. This chapter describes the support .NET provides for using ActiveX controls and COM components into your application, exposing .NET classes to COM-based applications, and making direct calls to Win32 APIs. You ll also learn about C# pointers and keywords for accessing memory directly, which can be necessary for using some unmanaged APIs.

ActiveX controls are COM components designed to be dropped into a form. They usually have a user interface, although you may come across nonvisual controls. When Microsoft developed the OCX standard, which allowed developers to build ActiveX controls in C++ and use them with VB (and vice versa), the ActiveX control revolution began. That was way back in 1994, and since then thousands of such controls have been developed, sold, and used. They are small, usually easy to work with, and are an effective example of binary reuse. That ActiveX controls are still popular more than a decade and a half after their invention demonstrates just how useful a lot of developers find them. COM objects are quite different from .NET objects under the covers. But Microsoft was well aware of how popular ActiveX controls had become by the time .NET was launched, and so it made sure that the .NET Framework and Visual Studio work hard

to bridge the gap between the COM and .NET worlds. Visual Studio is able to import COM components into any .NET project, and makes it particularly easy to use ActiveX controls from Windows Forms.

For our first example, we re going to use a fairly common ActiveX control that happens to be installed on most of the authors systems: the Adobe PDF Reader control. If you ve installed either Adobe s PDF reader or its Acrobat software, you ll have this control too. It allows any application to show a PDF file. To get started, create a C# Windows Forms application in Visual Studio 2010. Ensure that the Toolbox is visible if it s not, there s an item on the View menu to show it. Right-click on the Toolbox and select Add Tab, and then create a new tab called ActiveX, to make it easy to find the ActiveX controls among all the others available. Inside this new tab, right-click again, and select the Choose Items option. This will bring up the Choose Toolbox Items dialog box. Select the COM Components tab, as shown in Figure 19-1. You can select any number of controls here we re just selecting the Adobe PDF Reader.

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