diff --git a/src/csharp/Grpc.Core/AsyncClientStreamingCall.cs b/src/csharp/Grpc.Core/AsyncClientStreamingCall.cs
index 83231ce4df8..d66b0d49749 100644
--- a/src/csharp/Grpc.Core/AsyncClientStreamingCall.cs
+++ b/src/csharp/Grpc.Core/AsyncClientStreamingCall.cs
@@ -44,11 +44,13 @@ namespace Grpc.Core
     {
         readonly IClientStreamWriter<TRequest> requestStream;
         readonly Task<TResponse> result;
+        readonly Action disposeAction;
 
-        public AsyncClientStreamingCall(IClientStreamWriter<TRequest> requestStream, Task<TResponse> result)
+        public AsyncClientStreamingCall(IClientStreamWriter<TRequest> requestStream, Task<TResponse> result, Action disposeAction)
         {
             this.requestStream = requestStream;
             this.result = result;
+            this.disposeAction = disposeAction;
         }
 
         /// <summary>
@@ -90,8 +92,7 @@ namespace Grpc.Core
         /// </summary>
         public void Dispose()
         {
-            // TODO(jtattermusch): implement
-            throw new NotImplementedException();
+            disposeAction.Invoke();
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs b/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs
index 39a54cc9a3a..4c0d5936ac4 100644
--- a/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs
+++ b/src/csharp/Grpc.Core/AsyncDuplexStreamingCall.cs
@@ -44,11 +44,13 @@ namespace Grpc.Core
     {
         readonly IClientStreamWriter<TRequest> requestStream;
         readonly IAsyncStreamReader<TResponse> responseStream;
+        readonly Action disposeAction;
 
-        public AsyncDuplexStreamingCall(IClientStreamWriter<TRequest> requestStream, IAsyncStreamReader<TResponse> responseStream)
+        public AsyncDuplexStreamingCall(IClientStreamWriter<TRequest> requestStream, IAsyncStreamReader<TResponse> responseStream, Action disposeAction)
         {
             this.requestStream = requestStream;
             this.responseStream = responseStream;
+            this.disposeAction = disposeAction;
         }
 
         /// <summary>
@@ -81,8 +83,7 @@ namespace Grpc.Core
         /// </summary>
         public void Dispose()
         {
-            // TODO(jtattermusch): implement
-            throw new NotImplementedException();
+            disposeAction.Invoke();
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/AsyncServerStreamingCall.cs b/src/csharp/Grpc.Core/AsyncServerStreamingCall.cs
index 1036f4a3ec3..7a479b9a23d 100644
--- a/src/csharp/Grpc.Core/AsyncServerStreamingCall.cs
+++ b/src/csharp/Grpc.Core/AsyncServerStreamingCall.cs
@@ -43,10 +43,12 @@ namespace Grpc.Core
     public sealed class AsyncServerStreamingCall<TResponse> : IDisposable
     {
         readonly IAsyncStreamReader<TResponse> responseStream;
+        readonly Action disposeAction;
 
-        public AsyncServerStreamingCall(IAsyncStreamReader<TResponse> responseStream)
+        public AsyncServerStreamingCall(IAsyncStreamReader<TResponse> responseStream, Action disposeAction)
         {
             this.responseStream = responseStream;
+            this.disposeAction = disposeAction;
         }
 
         /// <summary>
@@ -68,8 +70,7 @@ namespace Grpc.Core
         /// </summary>
         public void Dispose()
         {
-            // TODO(jtattermusch): implement
-            throw new NotImplementedException();
+            disposeAction.Invoke();
         }
     }
 }
diff --git a/src/csharp/Grpc.Core/Calls.cs b/src/csharp/Grpc.Core/Calls.cs
index ba42a2d4f87..9f8baac6841 100644
--- a/src/csharp/Grpc.Core/Calls.cs
+++ b/src/csharp/Grpc.Core/Calls.cs
@@ -73,7 +73,7 @@ namespace Grpc.Core
             asyncCall.StartServerStreamingCall(req, call.Headers);
             RegisterCancellationCallback(asyncCall, token);
             var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
-            return new AsyncServerStreamingCall<TResponse>(responseStream);
+            return new AsyncServerStreamingCall<TResponse>(responseStream, asyncCall.Cancel);
         }
 
         public static AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
@@ -85,7 +85,7 @@ namespace Grpc.Core
             var resultTask = asyncCall.ClientStreamingCallAsync(call.Headers);
             RegisterCancellationCallback(asyncCall, token);
             var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
-            return new AsyncClientStreamingCall<TRequest, TResponse>(requestStream, resultTask);
+            return new AsyncClientStreamingCall<TRequest, TResponse>(requestStream, resultTask, asyncCall.Cancel);
         }
 
         public static AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Call<TRequest, TResponse> call, CancellationToken token)
@@ -98,7 +98,7 @@ namespace Grpc.Core
             RegisterCancellationCallback(asyncCall, token);
             var requestStream = new ClientRequestStream<TRequest, TResponse>(asyncCall);
             var responseStream = new ClientResponseStream<TRequest, TResponse>(asyncCall);
-            return new AsyncDuplexStreamingCall<TRequest, TResponse>(requestStream, responseStream);
+            return new AsyncDuplexStreamingCall<TRequest, TResponse>(requestStream, responseStream, asyncCall.Cancel);
         }
 
         private static void RegisterCancellationCallback<TRequest, TResponse>(AsyncCall<TRequest, TResponse> asyncCall, CancellationToken token)
diff --git a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
index 267852487c8..5aa6f4162d4 100644
--- a/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
+++ b/src/csharp/Grpc.Examples.Tests/MathClientServerTests.cs
@@ -96,7 +96,19 @@ namespace math.Tests
             Assert.AreEqual(0, response.Remainder);
         }
 
-        // TODO(jtattermusch): test division by zero
+        [Test]
+        public void DivByZero()
+        {
+            try
+            {
+                DivReply response = client.Div(new DivArgs.Builder { Dividend = 0, Divisor = 0 }.Build());
+                Assert.Fail();
+            }
+            catch (RpcException e)
+            {
+                Assert.AreEqual(StatusCode.Unknown, e.Status.StatusCode);
+            }   
+        }
 
         [Test]
         public void DivAsync()
@@ -119,7 +131,6 @@ namespace math.Tests
                     var responses = await call.ResponseStream.ToList();
                     CollectionAssert.AreEqual(new List<long> { 1, 1, 2, 3, 5, 8 },
                         responses.ConvertAll((n) => n.Num_));
-
                 }
             }).Wait();
         }
@@ -154,7 +165,6 @@ namespace math.Tests
                     new DivArgs.Builder { Dividend = 7, Divisor = 2 }.Build()
                 };
 
-
                 using (var call = client.DivMany())
                 {
                     await call.RequestStream.WriteAll(divArgsList);