protected void CalculateIncomeSum()
{
TreeIter iter;
IncomeTotal = 0m;
if(IncomeListStore.GetIterFirst(out iter))
{
IncomeTotal = Convert.ToDecimal(IncomeListStore.GetValue(iter,6));
while (IncomeListStore.IterNext(ref iter))
{
IncomeTotal += Convert.ToDecimal(IncomeListStore.GetValue(iter,6));
}
}
labelIncomeSum.Text = string.Format("Сумма: {0:C} ", IncomeTotal);
ShowStatus ();
}