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It is very easy to build these two-tier applications However, problems exist with such application architectures: The application does not scale to hundreds or thousands of users With more and more users, the only option is to replace the database server with a faster system All users are connected to the database, so a lot of resources are needed If the business logic changes, the application must be redistributed to all client systems With NET, redistribution is a lot easier via ClickOnce deployment; however, you must ensure that all client applications are redeployed simultaneously when the business requirements change Database drivers must be installed and maintained on the client systems Database connections cannot be shared among multiple users Every client needs a separate connection to the database With such client applications, you often need a connection within the local area network (LAN) After all, you must consider multination companies A simple two-tier application is not operational if it is on a laptop system that is disconnected from the corporate network It is difficult to split working on the code among multiple developers For example, the UI programmer might change the business logic quite unintentionally Reusing code among multiple applications is not possible

This chapter served as a rudimentary introduction to C# It provided a means of familiarizing you with basic C# syntax Because of C#'s similarity to C++ style languages, much of what I presented here should not have been new material However, C# and managed code do have some distinct characteristics, such as compilation down to CIL Although it is not unique, another key characteristic is that C# is entirely object oriented Even things like reading and writing data to the console are object oriented Object orientation is foundational to C#, and you will see this throughout this book The next chapter examines the fundamental data types that are part of the C# language, and discusses how you can use these data types with operands to form expressions

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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# Among the topics explored in depth are:

Consider a simple business scenario: ordering a course for a customer who is already registered within your course management system Which possibilities do you have to build a solution for this use case Figure 1-3 shows the use case diagram of this scenario

The IDisposable pattern contains one additional important call Back in Listing 921, the Close() method included a call to SystemGCSuppressFinalize() (captured again in Listing 923) Its purpose was to remove the TemporaryFileStream class instance from the finalization (f-reachable) queue

ASPNET architecture Web forms Configuration HTTP pipeline Diagnostics and error handling Validation Data binding Custom controls Caching State management

// public void Close() { _StreamClose(); FileDelete(); // Turn off calling the finalizer SystemGCSuppressFinalize(this); } //

Usually, methods are called in the serviced component synchronously With queued components (QCs), you can invoke methods asynchronously QCs also work in a disconnected environment The client can run on a laptop that is disconnected from the network while the application invokes methods that are defined with a QC in a recorder The overall QC architecture is shown in Figure 1-17 The recorder writes the method calls as messages in a message queue As soon as the laptop connects to the network, the message is forwarded to the target queue With the NET Enterprise Services application, a listener reads the message from the queue, and the player invokes the method in the QC

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