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diff --git a/Final/dotnet/Qpid.Client/Client/Closeable.cs b/Final/dotnet/Qpid.Client/Client/Closeable.cs
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index 0000000000..d70f75ee6b
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+++ b/Final/dotnet/Qpid.Client/Client/Closeable.cs
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+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+using System;
+
+namespace Apache.Qpid.Client
+{
+    public abstract class Closeable
+    {
+        /// <summary>
+        /// Used to ensure orderly closing of the object. The only method that is allowed to be called
+        /// from another thread of control is close().
+        /// </summary>
+        protected readonly object _closingLock = new object();
+
+        /// <summary>
+        /// All access to this field should be using the Inerlocked class, to make it atomic.
+        /// Hence it is an int since you cannot use a bool with the Interlocked class.
+        /// </summary>
+        protected int _closed = NOT_CLOSED;
+
+        protected const int CLOSED = 1;
+        protected const int NOT_CLOSED = 2;
+
+        /// <summary>
+        /// Checks the not closed.
+        /// </summary>
+        protected void CheckNotClosed()
+        {
+            if (_closed == CLOSED)
+            {
+                throw new InvalidOperationException("Object " + ToString() + " has been closed");
+            }
+        }
+
+        /// <summary>
+        /// Gets a value indicating whether this <see cref="Closeable"/> is closed.
+        /// </summary>
+        /// <value><c>true</c> if closed; otherwise, <c>false</c>.</value>
+        public bool Closed
+        {
+            get
+            {
+                return _closed == CLOSED;
+            }
+        }
+
+        /// <summary>
+        /// Close the resource
+        /// </summary>
+        /// <exception cref="QpidMessagingException">If something goes wrong</exception>
+        public abstract void Close();
+    }
+}