Added sample code from the Getting Started Wiki

src/AddressBook/AddressBook.csproj

@@ -56,10 +56,13 @@
   <ItemGroup>
     <Reference Include="mscorlib" />
     <Reference Include="System" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="AddPerson.cs" />
     <Compile Include="AddressBookProtos.cs" />
+    <Compile Include="SampleUsage.cs" />
     <Compile Include="ListPeople.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />

src/AddressBook/SampleUsage.cs

@@ -0,0 +1,44 @@
+using System;
+using System.IO;
+
+namespace Google.ProtocolBuffers.Examples.AddressBook
+{
+    class SampleUsage
+{
+    static void Main()
+    {
+        byte[] bytes;
+        //Create a builder to start building a message
+        Person.Builder newContact = Person.CreateBuilder();
+        //Set the primitive properties
+        newContact.SetId(1)
+                  .SetName("Foo")
+                  .SetEmail("foo@bar");
+        //Now add an item to a list (repeating) field
+        newContact.AddPhone(
+            //Create the child message inline
+            Person.Types.PhoneNumber.CreateBuilder().SetNumber("555-1212").Build()
+            );
+        //Now build the final message:
+        Person person = newContact.Build();
+        //The builder is no longer valid (at least not now, scheduled for 2.4):
+        newContact = null;
+        using(MemoryStream stream = new MemoryStream())
+        {
+            //Save the person to a stream
+            person.WriteTo(stream);
+            bytes = stream.ToArray();
+        }
+        //Create another builder, merge the byte[], and build the message:
+        Person copy = Person.CreateBuilder().MergeFrom(bytes).Build();
+
+        //A more streamlined approach might look like this:
+        bytes = AddressBook.CreateBuilder().AddPerson(copy).Build().ToByteArray();
+        //And read the address book back again
+        AddressBook restored = AddressBook.CreateBuilder().MergeFrom(bytes).Build();
+        //The message performs a deep-comparison on equality:
+        if(restored.PersonCount != 1 || !person.Equals(restored.PersonList[0]))
+            throw new ApplicationException("There is a bad person in here!");
+    }
+}
+}