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diff --git a/src/csharp/Grpc.IntegrationTesting/WorkerServiceImpl.cs b/src/csharp/Grpc.IntegrationTesting/WorkerServiceImpl.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.Threading;
+using System.Threading.Tasks;
+using Google.Protobuf;
+using Grpc.Core;
+using Grpc.Core.Utils;
+using Grpc.IntegrationTesting;
+
+namespace Grpc.Testing
+{
+    /// <summary>
+    /// Implementation of WorkerService server
+    /// </summary>
+    public class WorkerServiceImpl : WorkerService.IWorkerService
+    {
+        public async Task RunServer(IAsyncStreamReader<ServerArgs> requestStream, IServerStreamWriter<ServerStatus> responseStream, ServerCallContext context)
+        {
+            Grpc.Core.Utils.Preconditions.CheckState(await requestStream.MoveNext());
+            var serverConfig = requestStream.Current.Setup;
+            var runner = ServerRunners.CreateStarted(serverConfig);
+
+            await responseStream.WriteAsync(new ServerStatus
+            {
+                Stats = runner.GetStats(false),
+                Port = runner.BoundPort,
+                Cores = 0,  // TODO: set number of cores
+            });
+                
+            while (await requestStream.MoveNext())
+            {
+                var reset = requestStream.Current.Mark.Reset;
+                await responseStream.WriteAsync(new ServerStatus
+                {
+                    Stats = runner.GetStats(reset)
+                });
+            }
+            await runner.StopAsync();
+        }
+
+        public async Task RunClient(IAsyncStreamReader<ClientArgs> requestStream, IServerStreamWriter<ClientStatus> responseStream, ServerCallContext context)
+        {
+            Grpc.Core.Utils.Preconditions.CheckState(await requestStream.MoveNext());
+            var clientConfig = requestStream.Current.Setup;
+            var runner = ClientRunners.CreateStarted(clientConfig);
+
+            await responseStream.WriteAsync(new ClientStatus
+            {
+                Stats = runner.GetStats(false)
+            });
+
+            while (await requestStream.MoveNext())
+            {
+                var reset = requestStream.Current.Mark.Reset;
+                await responseStream.WriteAsync(new ClientStatus
+                {
+                    Stats = runner.GetStats(reset)
+                });
+            }
+            await runner.StopAsync();
+        }
+    }
+}