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diff --git a/src/csharp/Grpc.Core/Internal/Enums.cs b/src/csharp/Grpc.Core/Internal/Enums.cs
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+++ b/src/csharp/Grpc.Core/Internal/Enums.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.InteropServices;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// from grpc/grpc.h
+    /// </summary>
+    internal enum GRPCCallError
+    {
+        /* everything went ok */
+        GRPC_CALL_OK = 0,
+        /* something failed, we don't know what */
+        GRPC_CALL_ERROR,
+        /* this method is not available on the server */
+        GRPC_CALL_ERROR_NOT_ON_SERVER,
+        /* this method is not available on the client */
+        GRPC_CALL_ERROR_NOT_ON_CLIENT,
+        /* this method must be called before server_accept */
+        GRPC_CALL_ERROR_ALREADY_ACCEPTED,
+        /* this method must be called before invoke */
+        GRPC_CALL_ERROR_ALREADY_INVOKED,
+        /* this method must be called after invoke */
+        GRPC_CALL_ERROR_NOT_INVOKED,
+        /* this call is already finished
+     (writes_done or write_status has already been called) */
+        GRPC_CALL_ERROR_ALREADY_FINISHED,
+        /* there is already an outstanding read/write operation on the call */
+        GRPC_CALL_ERROR_TOO_MANY_OPERATIONS,
+        /* the flags value was illegal for this call */
+        GRPC_CALL_ERROR_INVALID_FLAGS
+    }
+
+    /// <summary>
+    /// grpc_completion_type from grpc/grpc.h
+    /// </summary>
+    internal enum GRPCCompletionType
+    {
+        /* Shutting down */
+        GRPC_QUEUE_SHUTDOWN,
+
+        /* operation completion */
+        GRPC_OP_COMPLETE,
+
+        /* A read has completed */
+        GRPC_READ,
+
+        /* A write has been accepted by flow control */
+        GRPC_WRITE_ACCEPTED,
+
+        /* writes_done or write_status has been accepted */
+        GRPC_FINISH_ACCEPTED,
+
+        /* The metadata array sent by server received at client */
+        GRPC_CLIENT_METADATA_READ,
+
+        /* An RPC has finished. The event contains status.
+         * On the server this will be OK or Cancelled. */
+        GRPC_FINISHED,
+
+        /* A new RPC has arrived at the server */
+        GRPC_SERVER_RPC_NEW,
+
+        /* The server has finished shutting down */
+        GRPC_SERVER_SHUTDOWN,
+
+        /* must be last, forces users to include a default: case */
+        GRPC_COMPLETION_DO_NOT_USE
+    }
+
+    /// <summary>
+    /// grpc_op_error from grpc/grpc.h
+    /// </summary>
+    internal enum GRPCOpError
+    {
+        /* everything went ok */
+        GRPC_OP_OK = 0,
+        /* something failed, we don't know what */
+        GRPC_OP_ERROR
+    }
+}
+