The question: Do you find Stack Overflow useful in your daily development work? Do you want to actively contribute to keep Stack Overflow's content top-notch? If yes, please read on.
The problem: The right answer (which just happens to be my answer in this case) for a very important question on this thread gets no justice and is being downvoted for appearance rather than content, while a very wrong answer is climbing up. The problem is that it will eventually contribute to the 'creation' and 'nurturing' of many bad developers if it stays the way it is (having a very wrong answer as an accepted top answer) as it's nearly as important as the 'What is the base type for all .Net classes?' question.
What you can do: If you feel any responsibility towards Stack Overflow for all the hours of work it has saved you and you want to contribute to help create more quality developers rather than bad developers you can visit the thread (what are the most used interfaces in C#?) and:
Upvote the question
downvote the highest answer
Give a few votes to my answer so at least it's not perceived as a wrong answer as it's currently below 0 (was above but got downvoted by some people)
If you do that, you can go to bed today feeling good that you have contributed in a good meaningful way to a good cause, if not then thanks for looking anyway.