void initFormOperations(int saleId)
{
tbl_Sale sale = Sale.getById(saleId);
dg_ItemPurchased.ItemsSource = SaleItem.getAllBySaleId(saleId);
tbl_Customer customer = Customer.getById((int)sale.Customer_Id);
if (customer != null)
{
lbl_CustomerName.Content = customer.Name;
}
lbl_SaleId.Content = saleId;
lbl_Date.Content = ((DateTime)sale.Date_Time).ToShortDateString();
lbl_Total.Content = sale.Amount;
}