Hi,
Which do you need to handle “24.28-”, as positive or negative?
If positive
Convert.ToDouble(row("Amount").ToString.TrimEnd("-"c)) +dbSumAmount
If negative
Convert.ToDouble(System.Text.RegularExpressions.Regex.Replace(row("Amount").ToString,"^([.,\d]+)(-)?$","$2$1")) +dbSumAmount
Hope the above helps you.
Regards,