'Why do I keep needing to rebuild solution in Visual Studio?

I'm new to Visual Studio, so I haven't gotten used to things yet. I've been using it for weeks with no problem, but today I've noticed that I have to click rebuild solution every time I make any changes to my code, otherwise it'll run an old version of the code. Is this a common thing? I've never had to do it until today, then all of a sudden I have to do it every time.



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