private void CityComboBox_SelectedIndexChanged(object sender, EventArgs e)
{
if (CityComboBox.SelectedIndex == -1)
{
LoadAd();
}
else
{
try
{
DgwIlan.DataSource = _adService.GetAdByCity(Convert.ToInt32(CityComboBox.SelectedValue));
}
catch
{
}
}
}