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diff --git a/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs b/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs
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+++ b/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs
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+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// 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.Runtime.CompilerServices;
+using System.Threading.Tasks;
+
+namespace Grpc.Core
+{
+    /// <summary>
+    /// Return type for bidirectional streaming calls.
+    /// </summary>
+    public sealed class AsyncDuplexStreamingCall<TRequest, TResponse>
+        where TRequest : class
+        where TResponse : class
+    {
+        readonly IClientStreamWriter<TRequest> requestStream;
+        readonly IAsyncStreamReader<TResponse> responseStream;
+
+        public AsyncDuplexStreamingCall(IClientStreamWriter<TRequest> requestStream, IAsyncStreamReader<TResponse> responseStream)
+        {
+            this.requestStream = requestStream;
+            this.responseStream = responseStream;
+        }
+
+        /// <summary>
+        /// Writes a request to RequestStream.
+        /// </summary>
+        public Task Write(TRequest message)
+        {
+            return requestStream.Write(message);
+        }
+
+        /// <summary>
+        /// Closes the RequestStream.
+        /// </summary>
+        public Task Close()
+        {
+            return requestStream.Close();
+        }
+
+        /// <summary>
+        /// Reads a response from ResponseStream.
+        /// </summary>
+        /// <returns></returns>
+        public Task<TResponse> ReadNext()
+        {
+            return responseStream.ReadNext();
+        }
+
+        /// <summary>
+        /// Async stream to read streaming responses.
+        /// </summary>
+        public IAsyncStreamReader<TResponse> ResponseStream
+        {
+            get
+            {
+                return responseStream;
+            }
+        }
+
+        /// <summary>
+        /// Async stream to send streaming requests.
+        /// </summary>
+        public IClientStreamWriter<TRequest> RequestStream
+        {
+            get
+            {
+                return requestStream;
+            }
+        }
+    }
+}