private void UpdateButton_Click(object sender, RoutedEventArgs e)
{
Advertisement newAds = new Advertisement();
newAds.AdvertisementID = Int32.Parse(idText.Text);
newAds.Deadline = AdsDeadline.SelectedDate.Value;
newAds.AdvertisementDescription = advertisementDescriptionText.Text;
newAds.AdvertisementStatus = "Active";
newAds.EmployeeID = ActiveUserController.GetActiveEmployee().EmployeeID;
AdvertisementController.UpdateAds(newAds);
refreshTable();
}