json-interface-serialization-2.cs

var myClassInstance = new MyClass();

// blah

string jsonData = JsonConvert.SerializeObject(myClassInstance, Formatting.Indented, new JsonSerializerSettings
{
    TypeNameHandling = TypeNameHandling.Objects,
    TypeNameAssemblyFormat = System.Runtime.Serialization.Formatters.FormatterAssemblyStyle.Simple
});