private void btnsale_Click(object sender, RoutedEventArgs e)
{
if (DGSales.SelectedItem == null && CbbxSalesPerson.SelectedItem == null && string.IsNullOrWhiteSpace(tbxTypeofTransaction.Text) && string.IsNullOrWhiteSpace(tbxPrice.Text))
{
MessageBox.Show("Du mangler at udfylde et felt");
}
else
{
handler.MakeSale((Car)DGSales.SelectedItem, (SalesPerson)CbbxSalesPerson.SelectedItem, tbxTypeofTransaction.Text, int.Parse(tbxPrice.Text));
tbxTypeofTransaction.Text = "";
tbxPrice.Text = "";
lbxAllSales.ItemsSource = handler.GetAllSales();
}
}
