Hour 17. Interfaces

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When you've always done something the same way using the same methods, it can be quite difficult to switch gears and think about the solution in a different way. Unless you are a seasoned COM programmer, interface-based programming can be a radical switch from the way you logically design and organize your code.

Interfaces play a crucial role in an object-oriented programming language. So much so that some debates have arisen in which many have argued that if a programming language does not support the use of interfaces, it's not an object-oriented programming language.

In this hour you will learn:

• What an interface is and why it's useful

• How to implement some of the defined interfaces within the .NET Framework

• How to define and implement your own interfaces

• How to implement interface inheritance

• How to use interfaces within a client application

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