title: ASP.NET isn't automatically rebuilding
body: <p>If you create an ASP.NET Web Site project and run it, you get a blank page. If you go into the default CodeBehind file, add into the Page_Load method <code>throw new Exception();</code>, save the file, and refresh it in the browser (without rebuilding), the server automatically rebuilds the project and the page will error.</p>
  
  <p>I have a project that I am working on now where refreshing the page does not cause the project to be rebuilt (the new aspx files are used but the old DLLs are used with them). What causes this, and how do I correct it?</p>