decimal.TryParse int.TryParse DateTime.TryParse

       decimal listPrice;
                    int size;
                    
                    decimal.TryParse(dr[5], System.Globalization.NumberStyles.AllowDecimalPoint, System.Globalization.CultureInfo.InvariantCulture, out listPrice);
                    
                    int.TryParse(dr[6], System.Globalization.NumberStyles.Integer, System.Globalization.CultureInfo.InvariantCulture, out size);

                                         Nullable<DateTime> dt_temp;
                    DateTime.TryParse(dr[13].ToString(), out ubto);