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executed. (This is the general case, since .NET code can also be pre-JITted at installation time.) The compilation process produces a Windows executable file in portable executable (PE) format. This has two important implications. First, the CLR neither knows, nor cares, what language was used to create the application or component. It just sees IL. Second, in theory, replacing the JIT compiler is all that s necessary to target a new platform. In practice, this will likely happen first for different versions of Windows including Windows CE and future 64-bit versions of Windows. 1.1.2 .NET and managed code .NET applications, running under the scheme shown in figure 1.1, are referred to as managed applications. In contrast, non-.NET Windows applications are known as unmanaged applications. Microsoft recognizes that managed and unmanaged code will coexist for many years to come and provides a means to allow both types of code to interoperate. Most common will be the need for .NET applications to coexist alongside COM in the immediate future. Therefore, Microsoft has endowed .NET with the ability to work with unmanaged COM components. It is also possible to register a .NET component as a COM object. Similarly, for Win32 API access, .NET allows managed code to call unmanaged functions in a Windows dynamic-link library (DLL). We ll look at some examples of .NET/COM/Win32 interoperation in the following chapters. In addition to JITting the code, the CLR manages applications by taking responsibility for loading and verifying code, garbage collection, protecting applications from each other, enforcing security, providing debugging and profiling services, and

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supporting versioning and deployment. Code management by the CLR provides an extra layer that decouples the application from the operating system. In the past, the services provided by this layer would have been implemented in the application itself, provided by the operating system, or done without. You may be wondering about the metadata emitted along with IL by the language compilers shown in figure 1.1. This is a key feature of .NET. For those of you familiar with COM or CORBA, the metadata can best be described as a form of Interface Definition Language (IDL) that is automatically produced by the language compiler. Metadata describes types including their fields, properties, method signatures, and supported operations. By producing this data automatically at compile time, .NET components are self-describing and no additional plumbing is required to get .NET components, written in different programming languages, to interoperate seamlessly.

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Without further delay, let s take a look at a simple .NET application. The program shown in listing 1.1 is a simple C# command-line program which greets the user.

What Is a Smart Client 1 Rich Client Applications 2 Thin Client Applications 2 Smart Client Applications 3 Types of Smart Clients 7 Windows Smart Client Applications 8 Office Smart Client Applications 8 Mobile Smart Client Applications 10 Choosing Between Smart Clients and Thin Clients 10 Smart Client Architectural Challenges 11 Scope of This Guide 13 How to Use This Guide 13 Who Should Read This Guide 14 Prerequisites 14 Outlines 14 1: Introduction 14 2: Handling Data 15 3: Getting Connected 15 4: Occasionally Connected Smart Clients 15 5: Security Considerations 15 6: Using Multiple Threads 15 7: Deploying and Updating Smart Client Applications 16 8: Smart Client Application Performance 16 Summary 16 More Information 16.

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Listing 1.1 Hello from C#

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Showcasing Data with Charts,

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// file : hello.cs // compile : csc hello.cs using System; class Hello { public static void Main() { Console.WriteLine("Hello from C#"); } }

To fully understand how smart clients combine the benefits of rich clients and thin clients, it is useful to examine the history and underlying principles behind the rich and thin client application models, and review some of the advantages and disadvantages associated with each.

Templates, Wizards, Add-Ins,

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Boxes, Frames, Backgrounds,

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