Tech: June 2017

When using Bundle, do not append the .min

bundles.Add(new StyleBundle("~/Content/bootstrap").Include(
    "~/Content/bootstrap.css", 
    "~/Content/bootstrap-theme.css"));

Based on the debug setting, (mostly web.config)

debug="true" - the non minified version will be used.
debug="false" - *.min.css will be searched, and if not found, the current will be minified

web.config setting:

<system.web>
  <compilation debug="true"...

Ref: https://stackoverflow.com/questions/20869907/adding-bootstrap-in-bundleconfig-doesnt-work-in-asp-net-mvc

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