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diff --git a/csharp/src/ProtocolBuffers/IRpcController.cs b/csharp/src/ProtocolBuffers/IRpcController.cs
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+#region Copyright notice and license
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// 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;
+
+namespace Google.ProtocolBuffers
+{
+    /// <summary>
+    /// Mediates a single method call. The primary purpose of the controller
+    /// is to provide a way to manipulate settings specific to the
+    /// RPC implementation and to find out about RPC-level errors.
+    /// 
+    /// The methods provided by this interface are intended to be a "least
+    /// common denominator" set of features which we expect all implementations to
+    /// support. Specific implementations may provide more advanced features,
+    /// (e.g. deadline propagation).
+    /// </summary>
+    public interface IRpcController
+    {
+        #region Client side calls
+
+        // These calls may be made from the client side only.  Their results
+        // are undefined on the server side (may throw exceptions).
+
+        /// <summary>
+        /// Resets the controller to its initial state so that it may be reused in
+        /// a new call.  This can be called from the client side only.  It must not
+        /// be called while an RPC is in progress.
+        /// </summary>
+        void Reset();
+
+        /// <summary>
+        /// After a call has finished, returns true if the call failed.  The possible
+        /// reasons for failure depend on the RPC implementation. Failed must
+        /// only be called on the client side, and must not be called before a call has
+        /// finished.
+        /// </summary>
+        bool Failed { get; }
+
+        /// <summary>
+        /// If Failed is true, ErrorText returns a human-readable description of the error.
+        /// </summary>
+        string ErrorText { get; }
+
+        /// <summary>
+        /// Advises the RPC system that the caller desires that the RPC call be
+        /// canceled. The RPC system may cancel it immediately, may wait awhile and
+        /// then cancel it, or may not even cancel the call at all. If the call is
+        /// canceled, the "done" callback will still be called and the RpcController
+        /// will indicate that the call failed at that time.
+        /// </summary>
+        void StartCancel();
+
+        #endregion
+
+        #region Server side calls
+
+        // These calls may be made from the server side only.  Their results
+        // are undefined on the client side (may throw exceptions).
+
+        /// <summary>
+        /// Causes Failed to return true on the client side. <paramref name="reason"/>
+        /// will be incorporated into the message returned by ErrorText.
+        /// If you find you need to return machine-readable information about
+        /// failures, you should incorporate it into your response protocol buffer
+        /// and should *not* call SetFailed.
+        /// </summary>
+        void SetFailed(string reason);
+
+        /// <summary>
+        /// If true, indicates that the client canceled the RPC, so the server may as
+        /// well give up on replying to it. This method must be called on the server
+        /// side only. The server should still call the final "done" callback.
+        /// </summary>
+        bool IsCanceled();
+
+        /// <summary>
+        /// Requests that the given callback be called when the RPC is canceled.
+        /// The parameter passed to the callback will always be null. The callback will
+        /// be called exactly once. If the RPC completes without being canceled, the
+        /// callback will be called after completion. If the RPC has already been canceled
+        /// when NotifyOnCancel is called, the callback will be called immediately.
+        /// 
+        /// NotifyOnCancel must be called no more than once per request. It must be
+        /// called on the server side only.
+        /// </summary>
+        /// <param name="callback"></param>
+        void NotifyOnCancel(Action<object> callback);
+
+        #endregion
+    }
+}
+\ No newline at end of file