Chapter 10. Dealing with Legacy Components in .NET

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	Migrating to .NET: A Pragmatic Path to Visual Basic .NET, Visual C++ .NET, and ASP.NET By Dhananjay  Katre, Prashant  Halari, Narayana  Rao  Surapaneni, Manu  Gupta, Meghana  Deshpande
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Code reusability is the art of using existing code to achieve better productivity and ease of maintenance. The concept of reusability is not new. Its existence has been evident since the evolution of mankind. Most of our daily activities are a continuation of an unfinished process and may not necessarily be a new process. We never try to reinvent a wheel; however, we try for effective ways to use it. Why should one repeatedly discuss code reusability when it has been addressed by so many across the globe on numerous occasions? Code reusability is a continuous and ongoing process. With new technologies emerging each day, we are nearing a day when we will see true code reusability.

Knowing about code reusability and COM interoperability for migration to .NET is of special importance because it helps developers migrate, and also helps designers and architects deliver better extensible, integral, and interoperable systems.

This chapter addresses the new look given to code reusability and COM interoperability in Microsoft .NET technology and how it differs from Microsoft's previous technologies. This is one of the important features to consider when you plan to migrate applications to the Microsoft .NET platform.

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