public void AddTaxService(int taxServiceId, int calculationMethod, decimal amount)
{
var t = TaxServices.SingleOrDefault(x => x.TaxServiceId == taxServiceId);
if (t == null)
{
t = new TaxService
{
Amount = amount,
CalculationType = calculationMethod,
TaxServiceId = taxServiceId
};
TaxServices.Add(t);
}
if (amount == 0)
{
if (t.Id > 0)
{
_removedTaxServices.Add(t);
}
TaxServices.Remove(t);
}
t.Amount = amount;
}
