private void btnCreateGiftSertificate_Click(object sender, RoutedEventArgs e)
{
CreateGiftSertificate createGiftSertificate = new CreateGiftSertificate();
createGiftSertificate.ShowDialog();
var query = from item in db.GiftSertificate
select item;
dgGiftSertificate.ItemsSource = query.ToList();
}
private void btnBuyGiftSertificate_Click(object sender, RoutedEventArgs e)
{
CreateGiftSertificate createGiftSertificate = new CreateGiftSertificate();
createGiftSertificate.ShowDialog();
}