Calendar show date with disable link on date 1,2,3,4,5,6,7,8,9,10 in c#

       
Calendar  show date with disable link on date 1,2,3,4,5,6,7,8,9,10.

if (dr["D" + i].ToString() == "1")

                            {

                                e.Cell.BackColor = Color.Green;

                                e.Day.IsSelectable = false;

                            }