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diff --git a/mcs/class/Mono.C5/hashing/HashDictionary.cs b/mcs/class/Mono.C5/hashing/HashDictionary.cs
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+#if NET_2_0
+/*
+ Copyright (c) 2003-2004 Niels Kokholm <kokholm@itu.dk> and Peter Sestoft <sestoft@dina.kvl.dk>
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+ 
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+ 
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+*/
+
+using System;
+using System.Diagnostics;
+using MSG = System.Collections.Generic;
+
+namespace C5
+{
+	/// <summary>
+	/// A generic dictionary class based on a hash set class <see cref="T:C5.HashSet!1"/>.
+	/// </summary>
+	public class HashDictionary<K,V>: DictionaryBase<K,V>, IDictionary<K,V>
+	{
+		/// <summary>
+		/// Create a hash dictionary using a default hasher for the keys.
+		/// Initial capacity of internal table will be 16 entries and threshold for 
+		/// expansion is 66% fill.
+		/// </summary>
+		public HashDictionary()
+		{
+			pairs = new HashSet<KeyValuePair<K,V>>(new KeyValuePairHasher<K,V>());
+		}
+
+		/// <summary>
+		/// Create a hash dictionary using a custom hasher for the keys.
+		/// Initial capacity of internal table will be 16 entries and threshold for 
+		/// expansion is 66% fill.
+		/// </summary>
+		/// <param name="h">The external key hasher</param>
+		public HashDictionary(IHasher<K> h)
+		{
+			pairs = new HashSet<KeyValuePair<K,V>>(new KeyValuePairHasher<K,V>(h));
+		}
+
+
+		/// <summary>
+		/// Create a hash dictionary using a custom hasher and prescribing the 
+		/// initial size of the dictionary and a non-default threshold for internal table expansion.
+		/// </summary>
+		/// <param name="capacity">The initial capacity. Will be rounded upwards to nearest
+		/// power of 2, at least 16.</param>
+		/// <param name="fill">The expansion threshold. Must be between 10% and 90%.</param>
+		/// <param name="h">The external key hasher</param>
+		public HashDictionary(int capacity, double fill, IHasher<K> h)
+		{
+			KeyValuePairHasher<K,V> kvph = new KeyValuePairHasher<K,V>(h);
+
+			pairs = new HashSet<KeyValuePair<K,V>>(capacity, fill, kvph);
+		}
+	}
+}
+#endif