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diff --git a/src/csharp/Grpc.Examples/MathServiceImpl.cs b/src/csharp/Grpc.Examples/MathServiceImpl.cs
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+++ b/src/csharp/Grpc.Examples/MathServiceImpl.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.Collections.Generic;
+using System.Reactive.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core.Utils;
+
+namespace math
+{
+    /// <summary>
+    /// Implementation of MathService server
+    /// </summary>
+    public class MathServiceImpl : MathGrpc.IMathService
+    {
+        public void Div(DivArgs request, IObserver<DivReply> responseObserver)
+        {
+            var response = DivInternal(request);
+            responseObserver.OnNext(response);
+            responseObserver.OnCompleted();
+        }
+
+        public void Fib(FibArgs request, IObserver<Num> responseObserver)
+        {
+            if (request.Limit <= 0)
+            {
+                // TODO: support cancellation....
+                throw new NotImplementedException("Not implemented yet");
+            }
+
+            if (request.Limit > 0)
+            {
+                foreach (var num in FibInternal(request.Limit))
+                {
+                    responseObserver.OnNext(num);
+                }
+                responseObserver.OnCompleted();
+            }
+        }
+
+        public IObserver<Num> Sum(IObserver<Num> responseObserver)
+        {
+            var recorder = new RecordingObserver<Num>();
+            Task.Factory.StartNew(() => {
+
+                List<Num> inputs = recorder.ToList().Result;
+
+                long sum = 0;
+                foreach (Num num in inputs)
+                {
+                    sum += num.Num_;
+                }
+
+                responseObserver.OnNext(Num.CreateBuilder().SetNum_(sum).Build());
+                responseObserver.OnCompleted();
+            });
+            return recorder;
+        }
+
+        public IObserver<DivArgs> DivMany(IObserver<DivReply> responseObserver)
+        {
+            return new DivObserver(responseObserver);
+        }
+
+        static DivReply DivInternal(DivArgs args)
+        {
+            long quotient = args.Dividend / args.Divisor;
+            long remainder = args.Dividend % args.Divisor;
+            return new DivReply.Builder { Quotient = quotient, Remainder = remainder }.Build();
+        }
+
+        static IEnumerable<Num> FibInternal(long n)
+        {
+            long a = 1;
+            yield return new Num.Builder { Num_=a }.Build();
+
+            long b = 1;
+            for (long i = 0; i < n - 1; i++)
+            {
+                long temp = a;
+                a = b;
+                b = temp + b;
+                yield return new Num.Builder { Num_=a }.Build();
+            }
+        }
+
+        private class DivObserver : IObserver<DivArgs> {
+
+            readonly IObserver<DivReply> responseObserver;
+
+            public DivObserver(IObserver<DivReply> responseObserver)
+            {
+                this.responseObserver = responseObserver;
+            }
+
+            public void OnCompleted()
+            {
+                Task.Factory.StartNew(() =>
+                    responseObserver.OnCompleted());
+            }
+
+            public void OnError(Exception error)
+            {
+                throw new NotImplementedException();
+            }
+
+            public void OnNext(DivArgs value)
+            {
+                // TODO: currently we need this indirection because
+                // responseObserver waits for write to finish, this
+                // callback is called from grpc threadpool which
+                // currently only has one thread.
+                // Same story for OnCompleted().
+                Task.Factory.StartNew(() =>
+                responseObserver.OnNext(DivInternal(value)));
+            }
+        }
+    }
+}
+