I have solved it so:

CellValuePresenter cvp1;

foreach (DataRecord record in _myView.MyTable.RecordManager.Unsorted)
{for (int iWeek = 1; iWeek <= 53; ++iWeek) 

{         coolumnValue = string.Format("Cell{0}", iWeek);

   if (record.Cells[coolumnValue].Value == null)   {  continue;}

                    columnType = string.Format("CellType{0}", iWeek);

                    cvp1 = CellValuePresenter.FromCell(record.Cells[coolumnValue]);
                
                    if ((int)record.Cells[columnType].Value == 8)
                    {
                        if (cvp1 != null)
                            cvp1.Background = Brushes.LightSalmon;
                    }

......