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List<object> lo = new List<object>();
List<dynamic> ld = new List<dynamic>();
lo = (List<dynamic>)ld;
List<object> lo = new List<object>();
List<dynamic> ld = new List<dynamic>();
ld.AddRange(from o in lo as IEnumerable<dynamic>
select (dynamic)o);
ld[0].UserID = 0;