column to be retrieved from the data base in the DGV

Question

  con.Open();
SqlCommand cmd = new SqlCommand("select  Faculty_Name from Tb_SCH_Faculty_Details", con);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                datagridView.Columns[2].HeaderText = dr[2].ToString().Trim();
                datagridView.Columns[3].HeaderText = dr[2].ToString().Trim();
                datagridView.Columns[4].HeaderText = dr[2].ToString().Trim();
                datagridView.Columns[5].HeaderText = dr[2].ToString().Trim();
                datagridView.Columns[6].HeaderText = dr[2].ToString().Trim();
                dr.Close();
                con.Close();
            }

when i run message shows index was outside the bound of array.


please help me.  i want to use the data reader through data reader i get the   Faculty Name from the data base.