Microsoft Office 2000 and later support new, uniform design
architecture for building application add-ins to enhance and to control Office
applications. These add-ins are called COM add-ins.
In this step-by-step article we will discusses Office COM
add-ins and describes how to build an Office COM add-in by using Microsoft
Visual Studio .NET.
In this article we will also discuss the five methods
provided by the IDTExtensibility2 interface. All COM add-ins inherit from this
interface and must implement each of its five methods.