Architecture in .NET framework

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Architecture
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Most applications, particularly business applications, contain at least three tiers:
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A source for storing and retrieving data (such as Microsoft SQL Server) Code that performs logic required in the application (such as code written using C#) Some form of interface that allows users to interact with the application (such as a Silverlight control)
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Twenty years ago, software applications would commonly handle all three tiers using a single technology This design is called single tier As computer networks advanced, client/server computing became popular Applications that utilize client/server computing store data in a separate location from the code and user interface technologies Separation of the tiers is implemented to improve performance and security Three-tier design takes things a step further by storing the data, code, and user interface on separate machines, and each can be created using the best technology for that tier For example, Microsoft SQL Server might be used to manage data, C# might be used to create code for an application, and Silverlight might be used to create the user interface
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12: Developing Line of Business (LOB) Applications
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If an application is carefully designed, the various tiers of the application can be much more flexible as well For example, a well-designed application may be able to access data stored in both Microsoft SQL Server and Oracle or provide user interfaces using both Silverlight and Windows Forms In order for an application design to be this flexible, each tier must be very modular and must not be coupled to other tiers In other words, each tier must make generic calls to other tiers without concern for or knowledge of the technology used to create the internal structure of the tier being called Note that the tier storing the data is the bottom tier, or the back end The tier storing the code is the middle tier, and it knows how to communicate only with the bottom tier Finally, the tier storing the user interface is the top tier, or the front end, and it does not communicate directly with the bottom tier but knows how to communicate only with the middle tier Creating tiers of an application to be extremely flexible, modular, and loosely coupled is increasingly important in modern applications that generally use the Web as a primary means of data transport Additionally, user interface technologies are becoming increasingly complex To compensate for user interface complexity and to ensure that the user interface is not tightly coupled to middle-tier technologies, well-documented and proven design patterns are commonly implemented Common design patterns used in Silverlight applications are the Model-View-Controller (MVC) pattern and the ModelView-View Model (MVVM) pattern
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The Model-View-Controller (MVC) pattern focuses on communication details between the user interface and the middle tier (business tier) Three components exist in the MVC pattern:
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Model The model represents the middle tier, or the business tier, and contains the code that determines how to store and retrieve data managed by the application and the code that performs the logic of the application View The view represents the user interface and is responsible for simply presenting user interface controls and displaying data to the user Controller The controller serves as the proxy object between the view and the model and determines how the two will interact
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The Model-View-View Model pattern is a fairly recent development that extends the ModelView-Controller pattern In the MVC pattern, the controller contains logic that determines how user interface events are handled and how data in the model is displayed in the view
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Silverlight includes the ability to directly bind controls to data sources and automatically keep the data being displayed synchronized with the underlying data source The ModelView-View Model pattern is designed to take advantage of this new data-binding capability In MVVM, the controller is replaced by a view model that the controls displayed in the view can directly bind to A view model exposes properties that reflect underlying data values
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