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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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