private void SearchButton_Click(object sender, RoutedEventArgs e)
{
int id = Int32.Parse(idText.Text);
Advertisement rslt = AdvertisementController.SearchByID(id);
if (rslt != null)
{
advertisementDescriptionText.Text = rslt.AdvertisementDescription;
AdsDeadline.SelectedDate = rslt.Deadline;
}
}