public static void DisplayInvoicePL() { try { objValidation = new InvoiceBLL(); INV_BLL.InvoiceBLL bllobj = new InvoiceBLL(); List <Invoice> iList = new List <Invoice>(); iList = bllobj.DisplayInvoiceBLL(); Console.WriteLine("Invoice Details"); Console.WriteLine("================="); foreach (Invoice i in iList) { Console.WriteLine("Invoice No :{0}\n Invoice Date :{1} \n Customer Name :{2} \n Product Name : {3} \n Amount : {4}", i.InvoiceNo, i.InvoiceDate, i.CustomerName, i.ProductName, i.Amount); } } catch (InvoiceException i) { Console.WriteLine(i.Message); } }