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diff --git a/csharp/src/ProtocolBuffers/AbstractMessageLite.cs b/csharp/src/ProtocolBuffers/AbstractMessageLite.cs
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+++ b/csharp/src/ProtocolBuffers/AbstractMessageLite.cs
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+#region Copyright notice and license
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System.IO;
+
+namespace Google.ProtocolBuffers
+{
+    /// <summary>
+    /// Implementation of the non-generic IMessage interface as far as possible.
+    /// </summary>
+    public abstract partial class AbstractMessageLite<TMessage, TBuilder> : IMessageLite<TMessage, TBuilder>
+        where TMessage : AbstractMessageLite<TMessage, TBuilder>
+        where TBuilder : AbstractBuilderLite<TMessage, TBuilder>
+    {
+        public abstract TBuilder CreateBuilderForType();
+
+        public abstract TBuilder ToBuilder();
+
+        public abstract TMessage DefaultInstanceForType { get; }
+
+        public abstract bool IsInitialized { get; }
+
+        public abstract void WriteTo(ICodedOutputStream output);
+
+        public abstract int SerializedSize { get; }
+
+        //public override bool Equals(object other) {
+        //}
+
+        //public override int GetHashCode() {
+        //}
+
+        public abstract void PrintTo(TextWriter writer);
+
+        #region IMessageLite<TMessage,TBuilder> Members
+
+        /// <summary>
+        /// Serializes the message to a ByteString. This is a trivial wrapper
+        /// around WriteTo(ICodedOutputStream).
+        /// </summary>
+        public ByteString ToByteString()
+        {
+            ByteString.CodedBuilder output = new ByteString.CodedBuilder(SerializedSize);
+            WriteTo(output.CodedOutput);
+            return output.Build();
+        }
+
+        /// <summary>
+        /// Serializes the message to a byte array. This is a trivial wrapper
+        /// around WriteTo(ICodedOutputStream).
+        /// </summary>
+        public byte[] ToByteArray()
+        {
+            byte[] result = new byte[SerializedSize];
+            CodedOutputStream output = CodedOutputStream.CreateInstance(result);
+            WriteTo(output);
+            output.CheckNoSpaceLeft();
+            return result;
+        }
+
+        /// <summary>
+        /// Serializes the message and writes it to the given stream.
+        /// This is just a wrapper around WriteTo(CodedOutputStream). This
+        /// does not flush or close the stream.
+        /// </summary>
+        /// <param name="output"></param>
+        public void WriteTo(Stream output)
+        {
+            CodedOutputStream codedOutput = CodedOutputStream.CreateInstance(output);
+            WriteTo(codedOutput);
+            codedOutput.Flush();
+        }
+
+        /// <summary>
+        /// Like WriteTo(Stream) but writes the size of the message as a varint before
+        /// writing the data. This allows more data to be written to the stream after the
+        /// message without the need to delimit the message data yourself. Use 
+        /// IBuilder.MergeDelimitedFrom(Stream) or the static method
+        /// YourMessageType.ParseDelimitedFrom(Stream) to parse messages written by this method.
+        /// </summary>
+        /// <param name="output"></param>
+        public void WriteDelimitedTo(Stream output)
+        {
+            CodedOutputStream codedOutput = CodedOutputStream.CreateInstance(output);
+            codedOutput.WriteRawVarint32((uint) SerializedSize);
+            WriteTo(codedOutput);
+            codedOutput.Flush();
+        }
+
+        IBuilderLite IMessageLite.WeakCreateBuilderForType()
+        {
+            return CreateBuilderForType();
+        }
+
+        IBuilderLite IMessageLite.WeakToBuilder()
+        {
+            return ToBuilder();
+        }
+
+        IMessageLite IMessageLite.WeakDefaultInstanceForType
+        {
+            get { return DefaultInstanceForType; }
+        }
+
+        #endregion
+    }
+}
+\ No newline at end of file