diff --git a/csharp/src/AddressBook/Addressbook.cs b/csharp/src/AddressBook/Addressbook.cs
new file mode 100644
index 0000000..166dd49
--- /dev/null
+++ b/csharp/src/AddressBook/Addressbook.cs
@@ -0,0 +1,473 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: addressbook.proto
+#pragma warning disable 1591, 0612, 3021
+#region Designer generated code
+
+using pb = global::Google.Protobuf;
+using pbc = global::Google.Protobuf.Collections;
+using pbr = global::Google.Protobuf.Reflection;
+using scg = global::System.Collections.Generic;
+namespace Google.Protobuf.Examples.AddressBook {
+
+  /// <summary>Holder for reflection information generated from addressbook.proto</summary>
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  public static partial class AddressbookReflection {
+
+    #region Descriptor
+    /// <summary>File descriptor for addressbook.proto</summary>
+    public static pbr::FileDescriptor Descriptor {
+      get { return descriptor; }
+    }
+    private static pbr::FileDescriptor descriptor;
+
+    static AddressbookReflection() {
+      byte[] descriptorData = global::System.Convert.FromBase64String(
+          string.Concat(
+            "ChFhZGRyZXNzYm9vay5wcm90bxIIdHV0b3JpYWwi1QEKBlBlcnNvbhIMCgRu",
+            "YW1lGAEgASgJEgoKAmlkGAIgASgFEg0KBWVtYWlsGAMgASgJEiwKBnBob25l",
+            "cxgEIAMoCzIcLnR1dG9yaWFsLlBlcnNvbi5QaG9uZU51bWJlchpHCgtQaG9u",
+            "ZU51bWJlchIOCgZudW1iZXIYASABKAkSKAoEdHlwZRgCIAEoDjIaLnR1dG9y",
+            "aWFsLlBlcnNvbi5QaG9uZVR5cGUiKwoJUGhvbmVUeXBlEgoKBk1PQklMRRAA",
+            "EggKBEhPTUUQARIICgRXT1JLEAIiLwoLQWRkcmVzc0Jvb2sSIAoGcGVvcGxl",
+            "GAEgAygLMhAudHV0b3JpYWwuUGVyc29uQlAKFGNvbS5leGFtcGxlLnR1dG9y",
+            "aWFsQhFBZGRyZXNzQm9va1Byb3Rvc6oCJEdvb2dsZS5Qcm90b2J1Zi5FeGFt",
+            "cGxlcy5BZGRyZXNzQm9va2IGcHJvdG8z"));
+      descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
+          new pbr::FileDescriptor[] { },
+          new pbr::GeneratedClrTypeInfo(null, new pbr::GeneratedClrTypeInfo[] {
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.Person), global::Google.Protobuf.Examples.AddressBook.Person.Parser, new[]{ "Name", "Id", "Email", "Phones" }, null, new[]{ typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType) }, new pbr::GeneratedClrTypeInfo[] { new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber), global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber.Parser, new[]{ "Number", "Type" }, null, null, null)}),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Protobuf.Examples.AddressBook.AddressBook), global::Google.Protobuf.Examples.AddressBook.AddressBook.Parser, new[]{ "People" }, null, null, null)
+          }));
+    }
+    #endregion
+
+  }
+  #region Messages
+  /// <summary>
+  ///  [START messages]
+  /// </summary>
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  public sealed partial class Person : pb::IMessage<Person> {
+    private static readonly pb::MessageParser<Person> _parser = new pb::MessageParser<Person>(() => new Person());
+    public static pb::MessageParser<Person> Parser { get { return _parser; } }
+
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Google.Protobuf.Examples.AddressBook.AddressbookReflection.Descriptor.MessageTypes[0]; }
+    }
+
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    public Person() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    public Person(Person other) : this() {
+      name_ = other.name_;
+      id_ = other.id_;
+      email_ = other.email_;
+      phones_ = other.phones_.Clone();
+    }
+
+    public Person Clone() {
+      return new Person(this);
+    }
+
+    /// <summary>Field number for the "name" field.</summary>
+    public const int NameFieldNumber = 1;
+    private string name_ = "";
+    public string Name {
+      get { return name_; }
+      set {
+        name_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    /// <summary>Field number for the "id" field.</summary>
+    public const int IdFieldNumber = 2;
+    private int id_;
+    /// <summary>
+    ///  Unique ID number for this person.
+    /// </summary>
+    public int Id {
+      get { return id_; }
+      set {
+        id_ = value;
+      }
+    }
+
+    /// <summary>Field number for the "email" field.</summary>
+    public const int EmailFieldNumber = 3;
+    private string email_ = "";
+    public string Email {
+      get { return email_; }
+      set {
+        email_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    /// <summary>Field number for the "phones" field.</summary>
+    public const int PhonesFieldNumber = 4;
+    private static readonly pb::FieldCodec<global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber> _repeated_phones_codec
+        = pb::FieldCodec.ForMessage(34, global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber.Parser);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber> phones_ = new pbc::RepeatedField<global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber>();
+    public pbc::RepeatedField<global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneNumber> Phones {
+      get { return phones_; }
+    }
+
+    public override bool Equals(object other) {
+      return Equals(other as Person);
+    }
+
+    public bool Equals(Person other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if (Name != other.Name) return false;
+      if (Id != other.Id) return false;
+      if (Email != other.Email) return false;
+      if(!phones_.Equals(other.phones_)) return false;
+      return true;
+    }
+
+    public override int GetHashCode() {
+      int hash = 1;
+      if (Name.Length != 0) hash ^= Name.GetHashCode();
+      if (Id != 0) hash ^= Id.GetHashCode();
+      if (Email.Length != 0) hash ^= Email.GetHashCode();
+      hash ^= phones_.GetHashCode();
+      return hash;
+    }
+
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    public void WriteTo(pb::CodedOutputStream output) {
+      if (Name.Length != 0) {
+        output.WriteRawTag(10);
+        output.WriteString(Name);
+      }
+      if (Id != 0) {
+        output.WriteRawTag(16);
+        output.WriteInt32(Id);
+      }
+      if (Email.Length != 0) {
+        output.WriteRawTag(26);
+        output.WriteString(Email);
+      }
+      phones_.WriteTo(output, _repeated_phones_codec);
+    }
+
+    public int CalculateSize() {
+      int size = 0;
+      if (Name.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(Name);
+      }
+      if (Id != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeInt32Size(Id);
+      }
+      if (Email.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(Email);
+      }
+      size += phones_.CalculateSize(_repeated_phones_codec);
+      return size;
+    }
+
+    public void MergeFrom(Person other) {
+      if (other == null) {
+        return;
+      }
+      if (other.Name.Length != 0) {
+        Name = other.Name;
+      }
+      if (other.Id != 0) {
+        Id = other.Id;
+      }
+      if (other.Email.Length != 0) {
+        Email = other.Email;
+      }
+      phones_.Add(other.phones_);
+    }
+
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            input.SkipLastField();
+            break;
+          case 10: {
+            Name = input.ReadString();
+            break;
+          }
+          case 16: {
+            Id = input.ReadInt32();
+            break;
+          }
+          case 26: {
+            Email = input.ReadString();
+            break;
+          }
+          case 34: {
+            phones_.AddEntriesFrom(input, _repeated_phones_codec);
+            break;
+          }
+        }
+      }
+    }
+
+    #region Nested types
+    /// <summary>Container for nested types declared in the Person message type.</summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    public static partial class Types {
+      public enum PhoneType {
+        MOBILE = 0,
+        HOME = 1,
+        WORK = 2,
+      }
+
+      [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+      public sealed partial class PhoneNumber : pb::IMessage<PhoneNumber> {
+        private static readonly pb::MessageParser<PhoneNumber> _parser = new pb::MessageParser<PhoneNumber>(() => new PhoneNumber());
+        public static pb::MessageParser<PhoneNumber> Parser { get { return _parser; } }
+
+        public static pbr::MessageDescriptor Descriptor {
+          get { return global::Google.Protobuf.Examples.AddressBook.Person.Descriptor.NestedTypes[0]; }
+        }
+
+        pbr::MessageDescriptor pb::IMessage.Descriptor {
+          get { return Descriptor; }
+        }
+
+        public PhoneNumber() {
+          OnConstruction();
+        }
+
+        partial void OnConstruction();
+
+        public PhoneNumber(PhoneNumber other) : this() {
+          number_ = other.number_;
+          type_ = other.type_;
+        }
+
+        public PhoneNumber Clone() {
+          return new PhoneNumber(this);
+        }
+
+        /// <summary>Field number for the "number" field.</summary>
+        public const int NumberFieldNumber = 1;
+        private string number_ = "";
+        public string Number {
+          get { return number_; }
+          set {
+            number_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+          }
+        }
+
+        /// <summary>Field number for the "type" field.</summary>
+        public const int TypeFieldNumber = 2;
+        private global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType type_ = global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType.MOBILE;
+        public global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType Type {
+          get { return type_; }
+          set {
+            type_ = value;
+          }
+        }
+
+        public override bool Equals(object other) {
+          return Equals(other as PhoneNumber);
+        }
+
+        public bool Equals(PhoneNumber other) {
+          if (ReferenceEquals(other, null)) {
+            return false;
+          }
+          if (ReferenceEquals(other, this)) {
+            return true;
+          }
+          if (Number != other.Number) return false;
+          if (Type != other.Type) return false;
+          return true;
+        }
+
+        public override int GetHashCode() {
+          int hash = 1;
+          if (Number.Length != 0) hash ^= Number.GetHashCode();
+          if (Type != global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType.MOBILE) hash ^= Type.GetHashCode();
+          return hash;
+        }
+
+        public override string ToString() {
+          return pb::JsonFormatter.ToDiagnosticString(this);
+        }
+
+        public void WriteTo(pb::CodedOutputStream output) {
+          if (Number.Length != 0) {
+            output.WriteRawTag(10);
+            output.WriteString(Number);
+          }
+          if (Type != global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType.MOBILE) {
+            output.WriteRawTag(16);
+            output.WriteEnum((int) Type);
+          }
+        }
+
+        public int CalculateSize() {
+          int size = 0;
+          if (Number.Length != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeStringSize(Number);
+          }
+          if (Type != global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType.MOBILE) {
+            size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Type);
+          }
+          return size;
+        }
+
+        public void MergeFrom(PhoneNumber other) {
+          if (other == null) {
+            return;
+          }
+          if (other.Number.Length != 0) {
+            Number = other.Number;
+          }
+          if (other.Type != global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType.MOBILE) {
+            Type = other.Type;
+          }
+        }
+
+        public void MergeFrom(pb::CodedInputStream input) {
+          uint tag;
+          while ((tag = input.ReadTag()) != 0) {
+            switch(tag) {
+              default:
+                input.SkipLastField();
+                break;
+              case 10: {
+                Number = input.ReadString();
+                break;
+              }
+              case 16: {
+                type_ = (global::Google.Protobuf.Examples.AddressBook.Person.Types.PhoneType) input.ReadEnum();
+                break;
+              }
+            }
+          }
+        }
+
+      }
+
+    }
+    #endregion
+
+  }
+
+  /// <summary>
+  ///  Our address book file is just one of these.
+  /// </summary>
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  public sealed partial class AddressBook : pb::IMessage<AddressBook> {
+    private static readonly pb::MessageParser<AddressBook> _parser = new pb::MessageParser<AddressBook>(() => new AddressBook());
+    public static pb::MessageParser<AddressBook> Parser { get { return _parser; } }
+
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Google.Protobuf.Examples.AddressBook.AddressbookReflection.Descriptor.MessageTypes[1]; }
+    }
+
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    public AddressBook() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    public AddressBook(AddressBook other) : this() {
+      people_ = other.people_.Clone();
+    }
+
+    public AddressBook Clone() {
+      return new AddressBook(this);
+    }
+
+    /// <summary>Field number for the "people" field.</summary>
+    public const int PeopleFieldNumber = 1;
+    private static readonly pb::FieldCodec<global::Google.Protobuf.Examples.AddressBook.Person> _repeated_people_codec
+        = pb::FieldCodec.ForMessage(10, global::Google.Protobuf.Examples.AddressBook.Person.Parser);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.Examples.AddressBook.Person> people_ = new pbc::RepeatedField<global::Google.Protobuf.Examples.AddressBook.Person>();
+    public pbc::RepeatedField<global::Google.Protobuf.Examples.AddressBook.Person> People {
+      get { return people_; }
+    }
+
+    public override bool Equals(object other) {
+      return Equals(other as AddressBook);
+    }
+
+    public bool Equals(AddressBook other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if(!people_.Equals(other.people_)) return false;
+      return true;
+    }
+
+    public override int GetHashCode() {
+      int hash = 1;
+      hash ^= people_.GetHashCode();
+      return hash;
+    }
+
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    public void WriteTo(pb::CodedOutputStream output) {
+      people_.WriteTo(output, _repeated_people_codec);
+    }
+
+    public int CalculateSize() {
+      int size = 0;
+      size += people_.CalculateSize(_repeated_people_codec);
+      return size;
+    }
+
+    public void MergeFrom(AddressBook other) {
+      if (other == null) {
+        return;
+      }
+      people_.Add(other.people_);
+    }
+
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            input.SkipLastField();
+            break;
+          case 10: {
+            people_.AddEntriesFrom(input, _repeated_people_codec);
+            break;
+          }
+        }
+      }
+    }
+
+  }
+
+  #endregion
+
+}
+
+#endregion Designer generated code