void DonemYukle()
{
IEnumerable <string> result = _kasa.Donem();
donemCombo.Items.Clear();
foreach (var item in result)
{
donemCombo.Items.Add(item);
}
if (donemCombo.Items.Count > 0)
{
donemCombo.SelectedIndex = 0;
}
}
public IEnumerable <string> Donem()
{
return(_manager.Donem());
}