gistfile1.cs

[Serializable]
class JsonIn
{
  internal string function;
  internal string type;
}

[Serializable]
class JsonOut
{
  internal string result;
  internal string content;
}

class Program
{
  static void Main(string[] args)
  {
    JsonIn jsonIn = new JsonIn();
    jsonIn.function = "test";
    jsonIn.type = "test";
    
    // Object to Stream
    MemoryStream stream = new MemoryStream();
    DataContractJsonSerializer dataSerializer = new DataContractJsonSerializer(typeof(JsonIn));
    dataSerializer.WriteObject(stream, JsonIn);
    
    // Stream to Object
    stream.Position = 0;
    JsonIn jsonIn2 = dataSerializer.ReadObject(stream) as JsonIn;
    
    stream.Close();
  }
}