diff --git a/csharp/src/AddressBook/SampleUsage.cs b/csharp/src/AddressBook/SampleUsage.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 SampleUsage
+    {
+        private static void Main()
+        {
+            byte[] bytes;
+            // Create a new person
+            Person person = new Person
+            {
+                Id = 1,
+                Name = "Foo",
+                Email = "foo@bar",
+                Phones = { new Person.Types.PhoneNumber { Number = "555-1212" } }
+            };
+            using (MemoryStream stream = new MemoryStream())
+            {
+                // Save the person to a stream
+                person.WriteTo(stream);
+                bytes = stream.ToArray();
+            }
+            Person copy = Person.Parser.ParseFrom(bytes);
+
+            AddressBook book = new AddressBook
+            {
+                People = { copy }
+            };
+            bytes = book.ToByteArray();
+            // And read the address book back again
+            AddressBook restored = AddressBook.Parser.ParseFrom(bytes);
+            // The message performs a deep-comparison on equality:
+            if (restored.People.Count != 1 || !person.Equals(restored.People[0]))
+            {
+                throw new ApplicationException("There is a bad person in here!");
+            }
+        }
+    }
+}
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