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diff --git a/src/csharp/Grpc.Core/Internal/CallError.cs b/src/csharp/Grpc.Core/Internal/CallError.cs
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+++ b/src/csharp/Grpc.Core/Internal/CallError.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;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// grpc_call_error from grpc/grpc.h
+    /// </summary>
+    internal enum CallError
+    {
+        /* everything went ok */
+        OK = 0,
+        /* something failed, we don't know what */
+        Error,
+        /* this method is not available on the server */
+        NotOnServer,
+        /* this method is not available on the client */
+        NotOnClient,
+        /* this method must be called before server_accept */
+        AlreadyAccepted,
+        /* this method must be called before invoke */
+        AlreadyInvoked,
+        /* this method must be called after invoke */
+        NotInvoked,
+        /* this call is already finished
+     (writes_done or write_status has already been called) */
+        AlreadyFinished,
+        /* there is already an outstanding read/write operation on the call */
+        TooManyOperations,
+        /* the flags value was illegal for this call */
+        InvalidFlags
+    }
+
+    internal static class CallErrorExtensions
+    {
+        /// <summary>
+        /// Checks the call API invocation's result is OK.
+        /// </summary>
+        public static void CheckOk(this CallError callError)
+        {
+            GrpcPreconditions.CheckState(callError == CallError.OK, "Call error: " + callError);
+        }
+    }
+}