private void Sum_TextChanged(object sender, TextChangedEventArgs e)
{
if (TransactionSum.Validate(true))
{
decimal remainingSum = owner.RemainingSum.DecimalValue - TransactionSum.DecimalValue;
RemainingSum.Text = $"{remainingSum:f2}";
}
AddTransaction.IsEnabled = IsSaveEnabled();
}
private bool IsSaveEnabled()
{
bool validReservation = ReservationId.Validate();
bool validSum = TransactionSum.Validate(true);
bool validDate = TransactionDate.SelectedDate != null;
bool validType = Validate(TransactionMethod);
bool validRemaining = Validate(RemainingSum);
return(validReservation && validSum && validDate && validType && validRemaining);
}