how to get distinct values from a list code example

Example 1: python list with only unique values

my_list = list(set(my_list))

Example 2: 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();
}