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I started to think about tracking changes in complex object graph in disconnected application. I have already found several solutions but I would like to know if there is any best practice or what solution do you use and why? I passed same question to MSDN forum but I received only single answer. I would like to have more answers to learn from experience of other developers. This question is related to .NET so for answers with implementation details I prefer answers related to .NET world but I think this is the same on other platforms. The theoretical problem in my case is defined in multi layered architecture (not necessarily n-tier at the moment) as follows: Layer of repositories using ORM to deal with persistence (ORM tool doesn't matter at the moment but it will most probably be Entity Framework 4.0 or NHibernate). Set of pure classes (persistent ignorant = POCO which is equivalent of POJO in Java world) representing domain objects. Repositories persists those classes and returns them as results of queries. Set of Domain services working with domain entities. Facade layer defining gateway to business logic. Internally it uses repositories, domain services and domain objects. Domain objects are not exposed - each facade method uses set of specialized Data transfer objects for parameter and return value. It is responsibility of each facade method to transform domain entity to DTO and vice-versa. Modern web application which uses facade layer and DTOs - I call this disconnected application. Generally design can change in future so that Facade layer will be wrapped by web service layer and web application will consume that services => transition to 3-tier (web, business logic, database). Now suppose that one of the domain object is Order

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