Chapter 9. Working with Legacy Code

Terms you'll need to understand:

• ActiveX controls

• COM/COM+ components

• Windows API

• Wrapper

• aximp.exe

• tlbimp.exe

• Platform Invoke

Techniques you'll need to master:

• Understanding the function of a proxy wrapper when integrating legacy components within .NET applications

• Knowing how to convert ActiveX controls to use within .NET applications

• Understanding how to use Platform Invoke to run common Windows API calls

Although the .NET Framework can handle almost all possible application-development needs, most organizations will implement new .NET applications within a collection of existing legacy code written using earlier technologies. In this chapter, we discuss the integration of legacy code objects within new .NET application development.