title: Why my visualstudio don't automatically build the start project when I debug the project
body: <p>Now when I Start Debug my project ,VS didn't automatically build.I must build the solution  manually.I google the question,but there is nothing to help me.</p>
  
  <p>Is there someone know the reason,How to solve the problem?</p>
  
  <p>Edit:
  The Question is duplicated of <a href="https://stackoverflow.com/questions/4922330/why-doesnt-f5-rebuild-project-before-execution-in-visual-studio">Why doesn't F5 rebuild project before execution in Visual Studio?</a></p>