Name of the process with highest cpu usage

Get-Process | Sort-Object CPU -desc | Select-Object -first 3 | Format-Table | CPU,ProcessName -hidetableheader

16.8041632 System
   12.568072 csrss
  11.9872368 powershell

using System.Diagnostics;

float GetAverageCPULoad(int procID, DateTme from, DateTime, to)
{
  // For the current process
  //Process proc = Process.GetCurrentProcess();
  // Or for any other process given its id
  Process proc = Process.GetProcessById(procID);
  System.TimeSpan lifeInterval = (to - from);
  // Get the CPU use
  float CPULoad = (proc.TotalProcessorTime.TotalMilliseconds /
                  lifeInterval.TotalMilliseconds) * 100;
  // You need to take the number of present cores into account
  return CPULoad / System.Environment.ProcessorCount;
}

class ProcLoad
{
  // Last time you checked for a process
  public Dictionary<int, DateTime> lastCheckedDict = new Dictionary<int, DateTime>();

  public float GetCPULoad(int procID)
  {
    if (lastCheckedDict.ContainsKey(procID))
    {
      DateTime last = lastCheckedDict[procID];
      lastCheckedDict[procID] = DateTime.Now;
      return GetAverageCPULoad(procID, last, lastCheckedDict[procID]);
    }
    else
    {
      lastCheckedDict.Add(procID, DateTime.Now);
      return 0;
    }
  }
}

Process.TotalProcessorTime