Example

using System;
using System.Threading;

namespace Samples
{
  public class DuplicateWaitObjectExceptionSample
  {
    public static AutoResetEvent[] autoResetEvents =
                                      new AutoResetEvent[2];
    public static void Main()
    {
      try
      {
        autoResetEvents[0] = new AutoResetEvent(false);
        autoResetEvents[1] = autoResetEvents[0];
        WaitHandle.WaitAll(autoResetEvents);
      }
      catch(DuplicateWaitObjectException e)
      {
        Console.WriteLine("Exception: {0}", e);
      }
    }
  }
}
The output is
 Exception: System.DuplicateWaitObjectException: Duplicate objects in argument. at System.Threading.WaitHandle.WaitMultiple(WaitHandle[] waitHandles, Int32 millisecondsTimeout, Boolean exitContext, Boolean WaitAll) at System.Threading.WaitHandle.WaitAll(WaitHandle[] waitHandles, Int32 millisecondsTimeout, ...

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