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diff --git a/lib/csharp/src/Protocol/TMultiplexedProtocol.cs b/lib/csharp/src/Protocol/TMultiplexedProtocol.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.
+ *
+ * Contains some contributions under the Thrift Software License.
+ * Please see doc/old-thrift-license.txt in the Thrift distribution for
+ * details.
+ */
+
+using System;
+using System.Text;
+using Thrift.Transport;
+using System.Collections.Generic;
+
+namespace Thrift.Protocol 
+{
+
+    /**
+     * TMultiplexedProtocol is a protocol-independent concrete decorator that allows a Thrift 
+     * client to communicate with a multiplexing Thrift server, by prepending the service name 
+     * to the function name during function calls.
+     *
+     * NOTE: THIS IS NOT TO BE USED BY SERVERS.  
+     * On the server, use TMultiplexedProcessor to handle requests from a multiplexing client.
+     *
+     * This example uses a single socket transport to invoke two services:
+     *
+     *     TSocket transport = new TSocket("localhost", 9090);
+     *     transport.open();
+     *     
+     *     TBinaryProtocol protocol = new TBinaryProtocol(transport);
+     *
+     *     TMultiplexedProtocol mp = new TMultiplexedProtocol(protocol, "Calculator");
+     *     Calculator.Client service = new Calculator.Client(mp);
+     *
+     *     TMultiplexedProtocol mp2 = new TMultiplexedProtocol(protocol, "WeatherReport");
+     *     WeatherReport.Client service2 = new WeatherReport.Client(mp2);
+     *
+     *     System.out.println(service.add(2,2));
+     *     System.out.println(service2.getTemperature());
+     *
+     */
+    public class TMultiplexedProtocol : TProtocolDecorator 
+    {
+
+        /** Used to delimit the service name from the function name */
+        public static String SEPARATOR = ":";
+
+        private String ServiceName;
+
+        /**
+         * Wrap the specified protocol, allowing it to be used to communicate with a
+         * multiplexing server.  The <code>serviceName</code> is required as it is
+         * prepended to the message header so that the multiplexing server can broker
+         * the function call to the proper service.
+         *
+         * Args:
+         *  protocol        Your communication protocol of choice, e.g. TBinaryProtocol
+         *  serviceName     The service name of the service communicating via this protocol.
+         */
+        public TMultiplexedProtocol(TProtocol protocol, String serviceName) 
+            : base(protocol)
+        {
+            ServiceName = serviceName;
+        }
+
+        /**
+         * Prepends the service name to the function name, separated by TMultiplexedProtocol.SEPARATOR.
+         * Args:
+         *   tMessage     The original message.
+         */
+        public override void WriteMessageBegin(TMessage tMessage) 
+        {
+            switch(tMessage.Type)
+            {
+                case TMessageType.Call:
+                case TMessageType.Oneway:
+                    base.WriteMessageBegin(new TMessage(
+                        ServiceName + SEPARATOR + tMessage.Name,
+                        tMessage.Type,
+                        tMessage.SeqID));
+                    break;
+
+                default:
+                    base.WriteMessageBegin(tMessage);
+                    break;
+            }
+        }
+    }
+
+}