Visual Studio Debugging Samples
Two samples show how to extend the Visual Studio debugger using Visual Studio SDK.
The Debugger Expression Evaluator Sample, for managed languages, is included in the Visual Studio SDK. In the Visual Studio SDK window, click the Samples tab, click All or C# in the list of languages, and then click Debugger.
The Visual Studio Debug Engine Sample, for native languages, is available on MSDN Code Gallery. For more information, see this page on the Microsoft Web site: Visual Studio Debug Engine Sample.