private static StreamWriter Save(WorkspaceModel model) { var persistance = new ModelPersistance(); var pmod = persistance.GetPersistantModel(model); MemoryStream ms = new MemoryStream(); StreamWriter writer = null; try { writer = new StreamWriter(ms, Encoding.UTF8); XMLSerialization.XMLSerialization.Serialize(pmod, writer); return(writer); } catch (Exception e) { throw new NullReferenceException(); } }