csharp kill one excel process

                
                        static public void KillExcelWorkbook(string wbook)
{
  Process[] processes = Process.GetProcessesByName("Excel");
  if (processes.Length == 0)
    return;
  foreach(Process p in processes)
  {
    if (p.MainWindowTitle.Contains(wbook))
    {
      p.Kill();
      return;
    }
  }
}