DateTime StartTransactionPeriod (int period, string periodType)
{
DateTime then = DateTime.Now;
switch (periodType)
{
case "sec":
then = then.AddSeconds(-period);
break;
case "min":
then = then.AddMinutes(-period);
break;
case "hour":
then = then.AddHours(-period);
break;
case "day":
then = then.AddDays(-period);
break;
case "week":
then = then.AddDays(-period * 7);
break;
case "month":
then = then.AddMonths(-period);
break;
case "year":
then = then.AddYears(-period);
break;
}
return then;
}