distinct on column in linq code example

Example 1: how to use distinct in linq query in c#

var distValues = objList.Select(o=>o.typeId).Distinct().ToList();

Example 2: linq distinct

var uniquePeople = from p in people
                   group p by new {p.ID} //or group by new {p.ID, p.Name, p.Whatever}
                   into mygroup
                   select mygroup.FirstOrDefault();