title: Visual Studio C# error 1 could not write to output file
body: <p>I have recently started C# programming, after having a crack at making my own calculator using Windows Forms i have started getting this error message :-</p>
  
  <blockquote>
    <p>Error 1   Could not write to output file ' c:\filepath\obj\Debug\My
    Calculator.exe' -- 'The process cannot access the file because it is
    being used by another process.</p>
  </blockquote>
  
  <ul>
  <li>I have tried turning off my anti-virus</li>
  <li>It isn't already running</li>
  </ul>
  
  <p>Im not very experienced so i don't know how to write my own code to bypass this error and can find anything useful information on the internet.</p>
  
  <p>Step by step help tips are always welcome :)</p>
  
  <p>edit: i thought it was too obvious too write down but the program i am creating isnt running (even in Task Manager) and im am using VS 2012.</p>