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diff --git a/src/mscorlib/shared/System/DuplicateWaitObjectException.cs b/src/mscorlib/shared/System/DuplicateWaitObjectException.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*=============================================================================
+**
+**
+**
+** Purpose: Exception class for duplicate objects in WaitAll/WaitAny.
+**
+**
+=============================================================================*/
+
+using System.Runtime.Serialization;
+
+namespace System
+{
+ // The DuplicateWaitObjectException is thrown when an object
+ // appears more than once in the list of objects to WaitAll or WaitAny.
+ //
+ [Serializable]
+ public class DuplicateWaitObjectException : ArgumentException
+ {
+ private static volatile String s_duplicateWaitObjectMessage = null;
+
+ private static String DuplicateWaitObjectMessage
+ {
+ get
+ {
+ if (s_duplicateWaitObjectMessage == null)
+ s_duplicateWaitObjectMessage = SR.Arg_DuplicateWaitObjectException;
+ return s_duplicateWaitObjectMessage;
+ }
+ }
+
+ // Creates a new DuplicateWaitObjectException with its message
+ // string set to a default message.
+ public DuplicateWaitObjectException()
+ : base(DuplicateWaitObjectMessage)
+ {
+ HResult = __HResults.COR_E_DUPLICATEWAITOBJECT;
+ }
+
+ public DuplicateWaitObjectException(String parameterName)
+ : base(DuplicateWaitObjectMessage, parameterName)
+ {
+ HResult = __HResults.COR_E_DUPLICATEWAITOBJECT;
+ }
+
+ public DuplicateWaitObjectException(String parameterName, String message)
+ : base(message, parameterName)
+ {
+ HResult = __HResults.COR_E_DUPLICATEWAITOBJECT;
+ }
+
+ public DuplicateWaitObjectException(String message, Exception innerException)
+ : base(message, innerException)
+ {
+ HResult = __HResults.COR_E_DUPLICATEWAITOBJECT;
+ }
+
+ // This constructor is required for serialization
+ protected DuplicateWaitObjectException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+ }
+}