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diff --git a/csharp/src/ProtocolBuffers/IMessage.cs b/csharp/src/ProtocolBuffers/IMessage.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;
+using System.Collections.Generic;
+using System.IO;
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers
+{
+    /// <summary>
+    /// Non-generic interface used for all parts of the API which don't require
+    /// any type knowledge.
+    /// </summary>
+    public interface IMessage : IMessageLite
+    {
+        /// <summary>
+        /// Returns the message's type's descriptor. This differs from the
+        /// Descriptor property of each generated message class in that this
+        /// method is an abstract method of IMessage whereas Descriptor is
+        /// a static property of a specific class. They return the same thing.
+        /// </summary>
+        MessageDescriptor DescriptorForType { get; }
+
+        /// <summary>
+        /// Returns a collection of all the fields in this message which are set
+        /// and their corresponding values.  A singular ("required" or "optional")
+        /// field is set iff HasField() returns true for that field.  A "repeated"
+        /// field is set iff GetRepeatedFieldSize() is greater than zero.  The
+        /// values are exactly what would be returned by calling
+        /// GetField(FieldDescriptor) for each field.  The map
+        /// is guaranteed to be a sorted map, so iterating over it will return fields
+        /// in order by field number. 
+        /// </summary>
+        IDictionary<FieldDescriptor, object> AllFields { get; }
+
+        /// <summary>
+        /// Returns true if the given field is set. This is exactly equivalent
+        /// to calling the generated "Has" property corresponding to the field.
+        /// </summary>
+        /// <exception cref="ArgumentException">the field is a repeated field,
+        /// or it's not a field of this type</exception>
+        bool HasField(FieldDescriptor field);
+
+        /// <summary>
+        /// Obtains the value of the given field, or the default value if
+        /// it isn't set. For value type fields, the boxed value is returned.
+        /// For enum fields, the EnumValueDescriptor for the enum is returned.
+        /// For embedded message fields, the sub-message
+        /// is returned. For repeated fields, an IList&lt;T&gt; is returned.
+        /// </summary>
+        object this[FieldDescriptor field] { get; }
+
+        /// <summary>
+        /// Returns the number of elements of a repeated field. This is
+        /// exactly equivalent to calling the generated "Count" property
+        /// corresponding to the field.
+        /// </summary>
+        /// <exception cref="ArgumentException">the field is not a repeated field,
+        /// or it's not a field of this type</exception>
+        int GetRepeatedFieldCount(FieldDescriptor field);
+
+        /// <summary>
+        /// Gets an element of a repeated field. For value type fields 
+        /// excluding enums, the boxed value is returned. For embedded
+        /// message fields, the sub-message is returned. For enums, the
+        /// relevant EnumValueDescriptor is returned.
+        /// </summary>
+        /// <exception cref="ArgumentException">the field is not a repeated field,
+        /// or it's not a field of this type</exception>
+        /// <exception cref="ArgumentOutOfRangeException">the index is out of
+        /// range for the repeated field's value</exception>
+        object this[FieldDescriptor field, int index] { get; }
+
+        /// <summary>
+        /// Returns the unknown fields for this message.
+        /// </summary>
+        UnknownFieldSet UnknownFields { get; }
+
+        /// <summary>
+        /// Returns true iff all required fields in the message and all embedded
+        /// messages are set.
+        /// </summary>
+        new bool IsInitialized { get; }
+
+        /// <summary>
+        /// Serializes the message and writes it to the given output stream.
+        /// This does not flush or close the stream.
+        /// </summary>
+        /// <remarks>
+        /// Protocol Buffers are not self-delimiting. Therefore, if you write
+        /// any more data to the stream after the message, you must somehow ensure
+        /// that the parser on the receiving end does not interpret this as being
+        /// part of the protocol message. One way of doing this is by writing the size
+        /// of the message before the data, then making sure you limit the input to
+        /// that size when receiving the data. Alternatively, use WriteDelimitedTo(Stream).
+        /// </remarks>
+        new void WriteTo(ICodedOutputStream output);
+
+        /// <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>
+        new void WriteDelimitedTo(Stream output);
+
+        /// <summary>
+        /// Returns the number of bytes required to encode this message.
+        /// The result is only computed on the first call and memoized after that.
+        /// </summary>
+        new int SerializedSize { get; }
+
+        #region Comparison and hashing
+
+        /// <summary>
+        /// Compares the specified object with this message for equality.
+        /// Returns true iff the given object is a message of the same type
+        /// (as defined by DescriptorForType) and has identical values
+        /// for all its fields.
+        /// </summary>
+        new bool Equals(object other);
+
+        /// <summary>
+        /// Returns the hash code value for this message.
+        /// TODO(jonskeet): Specify the hash algorithm, but better than the Java one!
+        /// </summary>
+        new int GetHashCode();
+
+        #endregion
+
+        #region Convenience methods
+
+        /// <summary>
+        /// Converts the message to a string in protocol buffer text format.
+        /// This is just a trivial wrapper around TextFormat.PrintToString.
+        /// </summary>
+        new string ToString();
+
+        /// <summary>
+        /// Serializes the message to a ByteString. This is a trivial wrapper
+        /// around WriteTo(ICodedOutputStream).
+        /// </summary>
+        new ByteString ToByteString();
+
+        /// <summary>
+        /// Serializes the message to a byte array. This is a trivial wrapper
+        /// around WriteTo(ICodedOutputStream).
+        /// </summary>
+        new byte[] ToByteArray();
+
+        /// <summary>
+        /// Serializes the message and writes it to the given stream.
+        /// This is just a wrapper around WriteTo(ICodedOutputStream). This
+        /// does not flush or close the stream.
+        /// </summary>
+        /// <param name="output"></param>
+        new void WriteTo(Stream output);
+
+        #endregion
+
+        /// <summary>
+        /// Creates a builder for the type, but in a weakly typed manner. This
+        /// is typically implemented by strongly typed messages by just returning
+        /// the result of CreateBuilderForType.
+        /// </summary>
+        new IBuilder WeakCreateBuilderForType();
+
+        /// <summary>
+        /// Creates a builder with the same contents as this message. This
+        /// is typically implemented by strongly typed messages by just returning
+        /// the result of ToBuilder.
+        /// </summary>
+        new IBuilder WeakToBuilder();
+
+        new IMessage WeakDefaultInstanceForType { get; }
+    }
+
+    public interface IMessage<TMessage> : IMessage, IMessageLite<TMessage>
+    {
+        /// <summary>
+        /// Returns an instance of this message type with all fields set to
+        /// their default values. This may or may not be a singleton. This differs
+        /// from the DefaultInstance property of each generated message class in that this
+        /// method is an abstract method of IMessage whereas DefaultInstance is
+        /// a static property of a specific class. They return the same thing.
+        /// </summary>
+        new TMessage DefaultInstanceForType { get; }
+    }
+
+    /// <summary>
+    /// Type-safe interface for all generated messages to implement.
+    /// </summary>
+    public interface IMessage<TMessage, TBuilder> : IMessage<TMessage>, IMessageLite<TMessage, TBuilder>
+        where TMessage : IMessage<TMessage, TBuilder>
+        where TBuilder : IBuilder<TMessage, TBuilder>
+    {
+        #region Builders
+
+        /// <summary>
+        /// Constructs a new builder for a message of the same type as this message.
+        /// </summary>
+        new TBuilder CreateBuilderForType();
+
+        /// <summary>
+        /// Creates a builder with the same contents as this current instance.
+        /// This is typically implemented by strongly typed messages by just
+        /// returning the result of ToBuilder().
+        /// </summary>
+        new TBuilder ToBuilder();
+
+        #endregion
+    }
+}
+\ No newline at end of file