True, however, the primary problem with the SO survey is the participants are self-selected [1], not randomly sampled. (It's explained in the survey's methodology).

What this means is we have no idea if the sample of programmers is representative of the worldwide programmer population.

I'd argue that C# and other Microsoft languages are vastly under-represented in the SO survey, but we have no way of knowing if that's true.

[1] https://en.wikipedia.org/wiki/Self-selection_bias