Let's just say that 9 out of 10 use C # as code, although this has not been proven. But the way I evaluate it from the point of view of the community, samples and all those I know. I have not seen anyone use VB as codebehind, but I'm sure there are. In fact, it will depend on what language is comfortable for you, it does not have real requirements for the code that stands as long as it is in .Net :)
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