using System.Linq;
using ServiceStack;
using ServiceStack.Text;
using System;

JsConfig.IncludeNullValues = false;
JsConfig.ExcludeDefaultValues = false;
JsConfig<Guid>.SerializeFn = guid => guid.ToString();
JsConfig<Guid>.IncludeDefaultValue = true;
var tt = new { Name="Fred", Value=Guid.Empty, Value2=Guid.NewGuid() };
var test = tt.ToJson();
Console.WriteLine(test);