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diff --git a/csharp/src/AddressBook/Program.cs b/csharp/src/AddressBook/Program.cs
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+#region Copyright notice and license

+// Protocol Buffers - Google's data interchange format

+// Copyright 2008 Google Inc.  All rights reserved.

+// https://developers.google.com/protocol-buffers/

+//

+// 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.Protobuf.Examples.AddressBook

+{

+    /// <summary>

+    /// Entry point. Repeatedly prompts user for an action to take, delegating actual behaviour

+    /// to individual actions. Each action has its own Main method, so that it can be used as an

+    /// invidual complete program.

+    /// </summary>

+    internal class Program

+    {

+        private static int Main(string[] args)

+        {

+            if (args.Length > 1)

+            {

+                Console.Error.WriteLine("Usage: AddressBook [file]");

+                Console.Error.WriteLine("If the filename isn't specified, \"addressbook.data\" is used instead.");

+                return 1;

+            }

+            string addressBookFile = args.Length > 0 ? args[0] : "addressbook.data";

+

+            bool stopping = false;

+            while (!stopping)

+            {

+                Console.WriteLine("Options:");

+                Console.WriteLine("  L: List contents");

+                Console.WriteLine("  A: Add new person");

+                Console.WriteLine("  Q: Quit");

+                Console.Write("Action? ");

+                Console.Out.Flush();

+                char choice = Console.ReadKey().KeyChar;

+                Console.WriteLine();

+                try

+                {

+                    switch (choice)

+                    {

+                        case 'A':

+                        case 'a':

+                            AddPerson.Main(new string[] {addressBookFile});

+                            break;

+                        case 'L':

+                        case 'l':

+                            ListPeople.Main(new string[] {addressBookFile});

+                            break;

+                        case 'Q':

+                        case 'q':

+                            stopping = true;

+                            break;

+                        default:

+                            Console.WriteLine("Unknown option: {0}", choice);

+                            break;

+                    }

+                }

+                catch (Exception e)

+                {

+                    Console.WriteLine("Exception executing action: {0}", e);

+                }

+                Console.WriteLine();

+            }

+            return 0;

+        }

+    }

+}
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