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Using c# 3 and .Net Framework 3.5, I have a Person object public Person { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public int SSN { get; set; } } and I've got a List of them: List<Person> persons = GetPersons(); How can I get all the Person objects in persons where SSN is not unique in the list and remove them from the persons list and ideally add them to another list called " List<Person> dupes "? The original list might look something like this: persons = new List<Person>(); persons.Add(new Person { Id = 1, FirstName = "Chris", LastName="Columbus", SSN=111223333 }); // Is a dupe persons.Add(new Person { Id = 1, FirstName = "E.E.", LastName="Cummings", SSN=987654321 }); persons.Add(new Person { Id = 1, FirstName = "John", LastName="Steinbeck", SSN=111223333 }); // Is a dupe persons.Add(new Person { Id = 1, FirstName = "Yogi", LastName="Berra", SSN=123456789 }); And the end result would have Cummings and Berra in the original persons list and would have Columbus and Steinbeck in a list called dupes. Many thanks!

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