CSHARP

c# distinct by property

objList.Select(o=>o.typeId).Distinct()

c# distinct array of objects by values

var uniquePersons = persons.GroupBy(p => p.Email)
                           .Select(grp => grp.First())
                           .ToArray();

c# get distinct values all fields from list

if (!IsPostBack) {  
       GridView1.DataSource = GetProducts()
                              .GroupBy(o => new { o.Make, o.Model })
                              .Select(o => o.FirstOrDefault());
       GridView1.DataBind();
}