title: Could not copy "obj\Debug\{project}.dll" to "bin\{project}.dll"
body: <p>Visual Studio Express 2013 for web has been throwing this error a lot lately when I try to run my project, and the only resolution I have found is to quit and relaunch Visual Studio or (sometimes) completely restart Windows. What could cause something like this?</p>
  
  <p><strong>Full Error Dump</strong></p>
  
  <pre><code>Error   19  Could not copy "obj\Debug\HobbsEventsMobile.dll" to "bin\HobbsEventsMobile.dll". Exceeded retry count of 10. Failed.    HobbsEventsMobile
  Error   20  Unable to copy file "obj\Debug\HobbsEventsMobile.dll" to "bin\HobbsEventsMobile.dll". The process cannot access the file 'bin\HobbsEventsMobile.dll' because it is being used by another process.   HobbsEventsMobile
  </code></pre>