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Documentation is a critical, and often overlooked, feature of the development process. Without documentation, other programmers, code reviewers, and project managers have a more difficult time analyzing the purpose and implementation of code. You can even have problems with your own code when it becomes complex, and having good internal documentation can aid in the development process.
XML comments are a way to provide that internal documentation for your code without having to go through the process to manually create and maintain a separate document. Instead, as you write your code, you include meta data at the top of every definition to explain the intent of your code. When the information has been included in your code, it can be consumed by Visual Studio to provide Object Browser and IntelliSense information.
GhostDoc is a free third-party extension ...