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diff --git a/src/ProtocolBuffers/GeneratedBuilderLite.cs b/src/ProtocolBuffers/GeneratedBuilderLite.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;
+using System.Collections.Generic;
+
+namespace Google.ProtocolBuffers {
+  /// <summary>
+  /// All generated protocol message builder classes extend this class. It implements
+  /// most of the IBuilder interface using reflection. Users can ignore this class
+  /// as an implementation detail.
+  /// </summary>
+  public abstract class GeneratedBuilderLite<TMessage, TBuilder> : AbstractBuilderLite<TMessage, TBuilder>
+    where TMessage : GeneratedMessageLite<TMessage, TBuilder>
+    where TBuilder : GeneratedBuilderLite<TMessage, TBuilder> {
+
+    /// <summary>
+    /// Returns the message being built at the moment.
+    /// </summary>
+    protected abstract TMessage MessageBeingBuilt { get; }
+
+    public override TBuilder MergeFrom(IMessageLite other) {
+      //do nothing, Lite runtime does not support cross-message merges
+      return ThisBuilder;
+    }
+
+    public abstract TBuilder MergeFrom(TMessage other);
+
+    public override bool IsInitialized {
+      get { return MessageBeingBuilt.IsInitialized; }
+    }
+
+    /// <summary>
+    /// Adds all of the specified values to the given collection.
+    /// </summary>
+    /// <exception cref="ArgumentNullException">Any element of the list is null</exception>
+    protected void AddRange<T>(IEnumerable<T> source, IList<T> destination) {
+      ThrowHelper.ThrowIfNull(source);
+      // We only need to check this for nullable types.
+      if (default(T) == null) {
+        ThrowHelper.ThrowIfAnyNull(source);
+      }
+      List<T> list = destination as List<T>;
+      if (list != null) {
+        list.AddRange(source);
+      } else {
+        foreach (T element in source) {
+          destination.Add(element);
+        }
+      }
+    }
+
+    /// <summary>
+    /// Called by derived classes to parse an unknown field.
+    /// </summary>
+    /// <returns>true unless the tag is an end-group tag</returns>
+    [CLSCompliant(false)]
+    protected virtual bool ParseUnknownField(CodedInputStream input, 
+                                     ExtensionRegistry extensionRegistry, uint tag) {
+      return input.SkipField(tag);
+    }
+
+    /// <summary>
+    /// Like Build(), but will wrap UninitializedMessageException in
+    /// InvalidProtocolBufferException.
+    /// </summary>
+    public TMessage BuildParsed() {
+      if (!IsInitialized) {
+        throw new UninitializedMessageException(MessageBeingBuilt).AsInvalidProtocolBufferException();
+      }
+      return BuildPartial();
+    }
+
+    /// <summary>
+    /// Implementation of <see cref="IBuilder{TMessage, TBuilder}.Build" />.
+    /// </summary>
+    public override TMessage Build() {
+      // If the message is null, we'll throw a more appropriate exception in BuildPartial.
+      if (MessageBeingBuilt != null && !IsInitialized) {
+        throw new UninitializedMessageException(MessageBeingBuilt);
+      }
+      return BuildPartial();
+    }
+  }
+}