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Before .NET Enter Microsoft .NET Compiling to the Common Intermediate Language (CIL) Compiling to Native Code and Execution The Common Language Runtime (CLR) The Common Language Infrastructure (CLI) Review of the Acronyms

An object model uses the principles of abstraction, encapsulation, modularity, hierarchy, typing, concurrency, polymorphism, and persistence. The object model enables you to create well-structured, complex systems. In an object model system, objects are the components of the system. Objects are instances of classes, and classes are related to other classes via inheritance relationships. An object has an identity, a state, and behavior. An object model helps you create reusable application frameworks and systems that can evolve over time. In addition, object-oriented systems are usually smaller than non-object-oriented implementations. A relational model defines the structure of data, data manipulation, and data integrity. Data is organized in the form of tables, and different tables are associated by means of referential integrity (a foreign key). Integrity constraints such as a primary key, unique check constraints, and not null are used to maintain an entity s integrity in the relational model. A relational data model isn t focused on supporting entity-type inheritance: entity-based polymorphic association from an object model can t be translated into similar entities in a relational model. In an object model, you use the state of the model to define equality between objects. But in a relational model, you use an entity s primary key to define equality of entities. Object references are used to associate different objects in an object model, whereas a foreign key is used to establish associations in a relational model. Object references in the object model facilitate easier navigation through the object graph. Because these two models are distinctly different, you need a way to persist object entities (Java objects) into a relational database. Figures 1-1 and 1-2 provide a simple representation of the object model and the relational model.

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nterprise Service Buses (ESBs) are all the rage in modern software development. You can t pick up a trade magazine these days without some article on ESBs and how they make your life wonderful. If you re a software development veteran, you ll recognize the hype immediately. ESBs aren t going to be the magic answer for our industry any more than were XML, web services, application servers, or even ASCII. Each of the aforementioned technologies started life with a lot of fanfare and unrealistic expectations (the result of the inevitable ignorance we all have with any emerging technology), and each technology ended up becoming a reliable tool to solve a specific set of problems. The same is true for the ESB. Putting the hype aside, let s focus on a bit of software history so we can better understand the problems that the ESB is designed to address.

The C# programming language was designed for developing programs for Microsoft s .NET Framework. This chapter will take a brief look at where .NET came from, and its basic architecture. Just to make sure you re starting on the right foot, let me take this opportunity to remind you of what is hopefully the obvious: C# sharp is pronounced see sharp.1

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