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diff --git a/csharp/src/AddressBook/ListPeople.cs b/csharp/src/AddressBook/ListPeople.cs
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+++ b/csharp/src/AddressBook/ListPeople.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 ListPeople
+    {
+        /// <summary>
+        /// Iterates though all people in the AddressBook and prints info about them.
+        /// </summary>
+        private static void Print(AddressBook addressBook)
+        {
+            foreach (Person person in addressBook.People)
+            {
+                Console.WriteLine("Person ID: {0}", person.Id);
+                Console.WriteLine("  Name: {0}", person.Name);
+                if (person.Email != "")
+                {
+                    Console.WriteLine("  E-mail address: {0}", person.Email);
+                }
+
+                foreach (Person.Types.PhoneNumber phoneNumber in person.Phones)
+                {
+                    switch (phoneNumber.Type)
+                    {
+                        case Person.Types.PhoneType.Mobile:
+                            Console.Write("  Mobile phone #: ");
+                            break;
+                        case Person.Types.PhoneType.Home:
+                            Console.Write("  Home phone #: ");
+                            break;
+                        case Person.Types.PhoneType.Work:
+                            Console.Write("  Work phone #: ");
+                            break;
+                    }
+                    Console.WriteLine(phoneNumber.Number);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Entry point - loads the addressbook and then displays it.
+        /// </summary>
+        public static int Main(string[] args)
+        {
+            if (args.Length != 1)
+            {
+                Console.Error.WriteLine("Usage:  ListPeople ADDRESS_BOOK_FILE");
+                return 1;
+            }
+
+            if (!File.Exists(args[0]))
+            {
+                Console.WriteLine("{0} doesn't exist. Add a person to create the file first.", args[0]);
+                return 0;
+            }
+
+            // Read the existing address book.
+            using (Stream stream = File.OpenRead(args[0]))
+            {
+                AddressBook addressBook = AddressBook.Parser.ParseFrom(stream);
+                Print(addressBook);
+            }
+            return 0;
+        }
+    }
+}
+\ No newline at end of file