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diff --git a/csharp/src/AddressBook/AddPerson.cs b/csharp/src/AddressBook/AddPerson.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;

+using System.IO;

+

+namespace Google.Protobuf.Examples.AddressBook

+{

+    internal class AddPerson

+    {

+        /// <summary>

+        /// Builds a person based on user input

+        /// </summary>

+        private static Person PromptForAddress(TextReader input, TextWriter output)

+        {

+            Person person = new Person();

+

+            output.Write("Enter person ID: ");

+            person.Id = int.Parse(input.ReadLine());

+

+            output.Write("Enter name: ");

+            person.Name = input.ReadLine();

+

+            output.Write("Enter email address (blank for none): ");

+            string email = input.ReadLine();

+            if (email.Length > 0)

+            {

+                person.Email = email;

+            }

+

+            while (true)

+            {

+                output.Write("Enter a phone number (or leave blank to finish): ");

+                string number = input.ReadLine();

+                if (number.Length == 0)

+                {

+                    break;

+                }

+

+                Person.Types.PhoneNumber phoneNumber = new Person.Types.PhoneNumber { Number = number };

+

+                output.Write("Is this a mobile, home, or work phone? ");

+                String type = input.ReadLine();

+                switch (type)

+                {

+                    case "mobile":

+                        phoneNumber.Type = Person.Types.PhoneType.MOBILE;

+                        break;

+                    case "home":

+                        phoneNumber.Type = Person.Types.PhoneType.HOME;

+                        break;

+                    case "work":

+                        phoneNumber.Type = Person.Types.PhoneType.WORK;

+                        break;

+                    default:

+                        output.Write("Unknown phone type. Using default.");

+                        break;

+                }

+

+                person.Phones.Add(phoneNumber);

+            }

+            return person;

+        }

+

+        /// <summary>

+        /// Entry point - loads an existing addressbook or creates a new one,

+        /// then writes it back to the file.

+        /// </summary>

+        public static int Main(string[] args)

+        {

+            if (args.Length != 1)

+            {

+                Console.Error.WriteLine("Usage:  AddPerson ADDRESS_BOOK_FILE");

+                return -1;

+            }

+

+            AddressBook addressBook;

+

+            if (File.Exists(args[0]))

+            {

+                using (Stream file = File.OpenRead(args[0]))

+                {

+                    addressBook = AddressBook.Parser.ParseFrom(file);

+                }

+            }

+            else

+            {

+                Console.WriteLine("{0}: File not found. Creating a new file.", args[0]);

+                addressBook = new AddressBook();

+            }

+

+            // Add an address.

+            addressBook.People.Add(PromptForAddress(Console.In, Console.Out));

+

+            // Write the new address book back to disk.

+            using (Stream output = File.OpenWrite(args[0]))

+            {

+                addressBook.WriteTo(output);

+            }

+            return 0;

+        }

+    }

+}
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