Under Tools – Options – Environment – Documents, there’s the option to Detect when file is changed outside the environment.  Under it is the subsequent option to auto-load changes, if saved.

Detect when file is changed outside Visual Studio option

Personally, I can’t imagine working without having the first checkbox enabled.  However, as for the second, I don’t think I’m brave enough to enable it.

If only the first checkbox is checked, then you’ll get this prompt.

File has been modified outside VS prompt

Maybe if you are doing a lot of modifying files outside VS, i could see this dialog getting annoying.  But since the option is global and sticky across VS sessions, I wouldn’t want to forget that I had it enabled.  But consider the source, as this is coming from the paranoid tester that I am (was).

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