private void populatePage()
{
lblReturnNo.Text = _saleReturn.barcode;
lblDate.Text = String.Format("{0:dd/MM/yy hh:mm}", _saleReturn.time_stamp);
//customer info
lblCustomerInfo.Text = _saleReturn.customer_info;
//sale summary
grid.AutoGenerateColumns = false;
DataTable dt = SaleItem.getReturnedItemSummary(_saleReturn.id);
grid.DataSource = dt;
Inventory.setAmount(lblTotalAmount, dt.Compute(String.Format("SUM({0})", SaleItem.COL_SUBTOTAL), "").ToString());
Inventory.setCount(lblTotalCounts, dt.Compute(String.Format("SUM({0})", SaleItem.COL_QTY), "").ToString(), dt.Compute(String.Format("SUM({0})", SaleItem.COL_LENGTH), "").ToString());
//notes
lblNotes.Text = _saleReturn.notes;
}