private void loadXML(ref TestGraph1 tg1) { XmlSerializationContext xmlsc = new XmlSerializationContext(); xmlsc.Load(System.Environment.GetEnvironmentVariable("TEMP") + "\\TestGraphPersistence.xml"); xmlsc.ContextEntities.Add("Model", new Model("Reconstituted Model")); tg1 = (TestGraph1)xmlsc.LoadObject("TG"); }