Supplying XML Code Comments
You can make the comments in source code files available as IntelliSense. When you add the /doc switch to the Visual Basic, C#, or C++ compiler command line, an .xml file is generated that serves as the basis for IntelliSense documentation.
For more information about documenting code in Visual Basic, see see How to: Create XML Documentation in Visual Basic.
For more information about documenting code in C#, see XML Documentation Comments (C# Programming Guide).