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  Tutorial: ASP.NET .NET Object Syntax Introduction Tutorial

A Sample Chapter 5 from 'Professional VB.NET 2nd Edition'. Visual Basic has had powerful object-oriented capabilities since the introduction of version 4.0. VB.NET carries that tradition forward. VB.NET simplifies some of the syntax and greatly enhances t

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ASP.NET .NET Object Syntax Introduction Tutorial
Visual Basic has had powerful object-oriented capabilities since the introduction of version 4.0. VB.NET carries that tradition forward. VB.NET simplifies some of the syntax and greatly enhances these capabilities, and now supports the four major defining concepts required for a language to be fully object-oriented.

VB has supported abstraction since VB4. Abstraction is merely the ability of a language to create "black box" code – to take a concept and create an abstract representation of that concept within a program. A Customer object, for instance, is an abstract representation of a real-world customer. A Recordset object is an abstract representation of a set of data.

This has also been with us since version 4.0. It's the concept of a separation between interface and implementation. The idea is that we can create an interface ( Public methods in a class) and, as long as that interface remains consistent, the application can interact with our objects. This remains true even if we entirely rewrite the code within a given method – thus the interface is independent of the implementation.

Encapsulation allows us to hide the internal implementation details of a class. For example, the algorithm we use to compute Pi might be proprietary. We can expose a simple API to the end user, but we hide all of the logic used by our algorithm by encapsulating it within our class.


 

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