public class andrea
    {
        public andrea(System.Int32 id_value, Nullable<System.DateTime> test_value)
        {
            id = id_value;
            test = test_value;

        }
        System.Int32 _id;
        public System.Int32 id
        {
            get { return _id; }
            set { _id = value; }
        }
        Nullable<System.DateTime> _test;
        public Nullable<System.DateTime> test
        {
            get { return _test; }
            set { _test = value; }
        }
    }

        List<andrea> ccc = new List<andrea>();
        ccc.Add(andrea(1, DateTime.Now));
        ccc.Add(andrea(2, DateTime.Now.AddDays(34)));
        fufu.DataSource = ccc;
        fufu.DataBind();
...
<asp:GridView id="fufu" runat="server" />