LINQ, Polymorphism, MetaDataMapping, Inheritance Mapper

pubic class ConcretePublicObjectOne : IPublicObject{}

static void Save<T>(T item)
        where T : class, IPublicObject
    {
        using (DataContext ctx = GetDataContext())
        {
            Table<T> table = ctx.GetTable<T>();
            // for insert...
            table.InsertOnSubmit(item);
            // for update...
            table.Attach(item, true);
            // for delete...
            table.DeleteOnSubmit(item);

            ctx.SubmitChanges();

        }
    }

Foo foo = new Foo();
    Save(foo); // <Foo> is inferred

Repository.Save(publicObject)

public class Repository {
    public void Save(IPublicObject publicObject) {
        publicObject.Save();
    }
}

public interface IPublicObject {
    void Save();
}