DataGridViewCellStyle cellStyle = new DataGridViewCellStyle();
            if (dataGridView2.Rows[2].Cells.ToString().Contains ("0"))
            {
                cellStyle.BackColor = Color.Red;
                

            }

foreach (DataGridViewRow row in dataGridView2.Rows)
                if (row.Cells[2].Value.ToString() == "0")
                row.Cells["KENNZEICHNUNG"].Style.BackColor = Color.Red;
             
            foreach(DataGridViewRow row in dataGridView2.Rows)
                if (row.Cells[2].Value.ToString() == "0")
                    row.Cells["STATUS"].Style.BackColor = Color.Red;