C# project NOT being rebuilt after modifications and starting Debug

Question

If I make a modification and don't explicitly tell it to rebuild, it won't. How can I get back to the old behaviour (attempt a rebuild before debug if the source was modified)?

Answer 1

Open Configuration manager and under the active solution configuration check build checkbox.

Answer 2

Under Tools/Options/Projects and Solution/Build and Run there is a Combobox titled "On run, when projects are out of date". Select "Always build".