distinct in select 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: select distinct linq mvc

public static IQueryable<ProdType> GetDistinctProdType(
    this IQueryable<ProdInfo> query,
    int categoryId)
{
    return (from p in query
            where p.CatID == categoryId
            select p.Type).Distinct();
}