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private void button3_Click(object sender, System.EventArgs e)
  {
   listBox1.Items .Clear();
   Process[] processes;
   processes=Process.GetProcesses ();
   foreach(Process p in processes)
   {
    if(p.ProcessName !="Idle")
    {
     this.listBox1 .Items .Add(string.Format ("{0,-30}{1:h:m:s}",p.ProcessName ,p.StartTime ));
    }
   }
  }