public string DeleteItem(string ItemCode)
        {
            string Result = "Success";

            try
            {
                Purchase_Order_Processing_System.ITEM item = poDb.ITEMs.Where(x => x.ITCODE == ItemCode).ToList().FirstOrDefault();
                poDb.ITEMs.Remove(item);
                poDb.SaveChanges();
            }
            catch (Exception ex)
            {
                Result = ex.Message;
            }
            return(Result);
        }
        public string UpdateItem(ITEM Item)
        {
            string Result = "Success";

            try
            {
                Purchase_Order_Processing_System.ITEM _ITEM = poDb.ITEMs.Where(x => x.ITCODE == Item.ITCODE).ToList().FirstOrDefault();
                _ITEM.ITDESC = Item.ITDESC;
                _ITEM.ITRATE = Item.ITRATE;
                poDb.SaveChanges();
            }
            catch (Exception ex)
            {
                Result = ex.Message;
            }
            return(Result);
        }