private void BtnDone_Click(object sender, RoutedEventArgs e) { DataTable table = new DataTable(); dataAccess data = new dataAccess(); table = data.getAllProduct(); for (int i = 0; i < table.Rows.Count; i++) { for (int a = 0; a < prodName.Count; a++) { if (table.Rows[i]["ProductName"].ToString().Equals(prodName[a].ToString())) { sum = sum + amt[a]; a = prodName.Count + 1000; } } } totalLabel.Content = "R " + (sum + (sum * 0.15)); //tableRecords = ((DataView)invoiceGrid.ItemsSource).ToTable(); }