title: ASP.NET when am I meant to build my project
body: <p>Totally stupid question, but I'm writing my first ASP.NET C# web forms application and sometimes I can just write a change and save it in Visual Studio and it works just dandy, but other times it seems I have to rebuild the project for changes to take effect.</p>
  
  <p>Could anyone please tell me what conditions need to be met for me to rebuild?</p>
  
  <p>Thanks!</p>
  
  <p>Tom</p>