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The following complies but at run time throws an exception. What I am trying to do is to cast a class PersonWithAge to a class of Person. How do I do this and what is the work around? class Person { public int Id { get; set; } public string Name { get; set; } } class PersonWithAge { public int Id { get; set; } public string Name { get; set; } public int Age { get; set; } } class Program { static void Main(string[] args) { IEnumerable<PersonWithAge> pwa = new List<PersonWithAge> { new PersonWithAge {Id = 1, Name = "name1", Age = 23}, new PersonWithAge {Id = 2, Name = "name2", Age = 32} }; IEnumerable<Person> p = pwa.Cast<Person>(); foreach (var i in p) { Console.WriteLine(i.Name); } } } EDIT: By the way PersonWithAge will always contain the same properties as Person plus a couple more. EDIT 2 Sorry guys but I should have made this a bit clearer, say I have two db views in a database that contains the same columns but view 2 contains 1 extra field. My model view entities are generated by a tool that mimics the database views. I have a MVC partial view that inherits from one of the class entities but I have more than one way to grab data... Not sure if this helps but it means that I cant make personWithAge inherit from person.

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