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diff --git a/csharp/src/Google.Protobuf.Conformance/Program.cs b/csharp/src/Google.Protobuf.Conformance/Program.cs
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+#region Copyright notice and license
+// Protocol Buffers - Google's data interchange format
+// Copyright 2015 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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 Conformance;
+using System;
+using System.IO;
+
+namespace Google.Protobuf.Conformance
+{
+    /// <summary>
+    /// Conformance tests. The test runner will provide JSON or proto data on stdin,
+    /// and this program will produce its output on stdout.
+    /// </summary>
+    class Program
+    {
+        private static void Main(string[] args)
+        {
+            // This way we get the binary streams instead of readers/writers.
+            var input = new BinaryReader(Console.OpenStandardInput());
+            var output = new BinaryWriter(Console.OpenStandardOutput());
+
+            int count = 0;
+            while (RunTest(input, output))
+            {
+                count++;
+            }
+            Console.Error.WriteLine("Received EOF after {0} tests", count);
+        }
+
+        private static bool RunTest(BinaryReader input, BinaryWriter output)
+        {
+            int? size = ReadInt32(input);
+            if (size == null)
+            {
+                return false;
+            }
+            byte[] inputData = input.ReadBytes(size.Value);
+            if (inputData.Length != size.Value)
+            {
+                throw new EndOfStreamException("Read " + inputData.Length + " bytes of data when expecting " + size);
+            }
+            ConformanceRequest request = ConformanceRequest.Parser.ParseFrom(inputData);
+            ConformanceResponse response = PerformRequest(request);
+            byte[] outputData = response.ToByteArray();
+            output.Write(outputData.Length);
+            output.Write(outputData);
+            // Ready for another test...
+            return true;
+        }
+
+        private static ConformanceResponse PerformRequest(ConformanceRequest request)
+        {
+            TestAllTypes message;
+            switch (request.PayloadCase)
+            {
+                case ConformanceRequest.PayloadOneofCase.JsonPayload:
+                    return new ConformanceResponse { Skipped = "JSON parsing not implemented in C# yet" };
+                case ConformanceRequest.PayloadOneofCase.ProtobufPayload:
+                    try
+                    {
+                        message = TestAllTypes.Parser.ParseFrom(request.ProtobufPayload);
+                    }
+                    catch (InvalidProtocolBufferException e)
+                    {
+                        return new ConformanceResponse { ParseError = e.Message };
+                    }
+                    break;
+                default:
+                    throw new Exception("Unsupported request payload: " + request.PayloadCase);
+            }
+            switch (request.RequestedOutputFormat)
+            {
+                case global::Conformance.WireFormat.JSON:
+                    return new ConformanceResponse { JsonPayload = JsonFormatter.Default.Format(message) };
+                case global::Conformance.WireFormat.PROTOBUF:
+                    return new ConformanceResponse { ProtobufPayload = message.ToByteString() };
+                default:
+                    throw new Exception("Unsupported request output format: " + request.PayloadCase);
+            }
+        }
+
+        private static int? ReadInt32(BinaryReader input)
+        {
+            byte[] bytes = input.ReadBytes(4);
+            if (bytes.Length == 0)
+            {
+                // Cleanly reached the end of the stream
+                return null;
+            }
+            if (bytes.Length != 4)
+            {
+                throw new EndOfStreamException("Read " + bytes.Length + " bytes of size when expecting 4");
+            }
+            return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
+        }
+    }
+}