title: How do I get the CPU Usage based on a Process ID and not the name of the process
body: <p>So I have this application which starts a new instance of a java process.
  There is no other way to distinguish the different java processes running on my PC besides the process ID.
  Also, let's say I were to just put in the name if the process, it would get a random one and it just wouldnt work out well, also what if I sent the application to my friend and the process anem would be different. That would just be bad.</p>
  
  <p>So I been looking around at how to get the CPU usage based upon a specific process ID.
  I have no idea how to do that though, I've looked into the <code>Performance Counter</code> class but it doesnt seem to take a process ID as one of its parameters.</p>
  
  <p>How do I properly evaluate the CPU usage given a specific process ID?</p>