public static void MarkAsOutstanding(IEnumerable <Sale> selectedMailings, ESolutions.Web.UI.Page page)
        {
            foreach (var runner in selectedMailings)
            {
                runner.DateOfPayment = null;
            }

            MyDataContext.Default.SaveChanges();
        }
        public static void MarkAsPaiedAny(IEnumerable <Sale> selectedMailings, ESolutions.Web.UI.Page page)
        {
            foreach (var runner in selectedMailings)
            {
                runner.PaidWithPayPal = false;
                runner.DateOfPayment  = DateTime.Now;
            }

            MyDataContext.Default.SaveChanges();
        }
        private static void Print(IEnumerable <Sale> selectedSales, ESolutions.Web.UI.Page page)
        {
            PdfDocument result = new PdfDocument();

            foreach (var runner in selectedSales)
            {
                Sales.Print.PrintToPdf(result, page, runner);
            }

            page.Response.SendPdfFile("Sales", result);
        }