title: Restrict multiple instances of an application
body: <p>Okay, so i've created my c# application, created an installer for it and have it working installed on my machine.</p>
  
  <p>The problem is, when the user opens the application exe twice, there will be two instances of the application running. I only ever want one instance of the application to be running at any time, how do I go about doing this?</p>
  
  <p>Thanks for your help,</p>