Conect вручную из MS SQL в datagrid?

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Мне нужно соединиться

tring saveStaff = "Select roba as 'Naziv artikla', SUM (cast(kolicina as float)) as 'Količina' from (select roba, kolicina from mp_racun_roba union all select roba, kolicina from mp_faktura_roba) as alltables group by roba";

Чтобы очистить datagrid

Строка работает, но добавляет новый столбец...не в моем фактическом столбце

В чем я ошибся?

Что я уже пробовал:

private void trenutne_zalihe2()
        {
            using (SqlConnection openCon = new SqlConnection(cs))

            {

                string saveStaff = "Select roba as 'Naziv artikla', SUM (cast(kolicina as float)) as 'Količina' from (select roba, kolicina from mp_racun_roba union all select roba, kolicina from mp_faktura_roba) as alltables group by roba";

                                
                using (SqlDataAdapter querySaveStaff = new SqlDataAdapter(saveStaff, cs))

                {
                    DataTable dt = new DataTable();
                    querySaveStaff.Fill(dt);
                    trenutnazalihadataGridView.DataSource = dt;
                    trenutnazalihadataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
                      
                    trenutnazalihadataGridView.Columns["naziv_artikla"].FillWeight = 571;  
                    trenutnazalihadataGridView.Columns["kolicina"].FillWeight = 200; 
                 
                    

                    trenutnazalihadataGridView.Update();
                    trenutnazalihadataGridView.Refresh();
                }

            }

        }

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