C# Waiting for multiple threads to finish

by 
List<Thread> threads = new List<Thread>();
foreach (cpsComms.cpsSerial ser in availPorts)
{
    Thread t = new Thread(new ParameterizedThreadStart(lookForValidDev));
    t.Start((object)ser);//start thread and pass it the port
    threads.Add(t);
}
foreach(var thread in threads)
{
    thread.Join();
}

Edit

I was looking back at this, and I like the following better

availPorts.Select(ser =>
      {
          Thread thread = new Thread(lookForValidDev);
          thread.Start(ser);
          return thread;
      }).ToList().ForEach(t => t.Join());

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