public ActionResult Purchase(int id)
        {
            try
            {
                var vm = new MarketEntryPurchaseViewModel
                {
                    MarketEntryDetails = _marketEntryManager.RetreiveMarketEntryDetailByID(id)
                };

                return(View(vm));
            }
            catch (Exception ex)
            {
                return(RedirectToAction("Index", "Error", new { message = ex.Message, stackTrace = ex.StackTrace }));
            }
        }
        public ActionResult Purchase(MarketEntryPurchaseViewModel pvm)
        {
            try
            {
                var userId = (int)System.Web.HttpContext.Current.Session["userID"];
                var user   = new User
                {
                    UserID = userId
                };
                var marketEntry = new MarketEntry
                {
                    MarketEntryID = pvm.MarketEntryDetails.MarketEntry.MarketEntryID
                };
                _marketEntryManager.AddMarketEntryPurchase(user, marketEntry);
            }
            catch (Exception ex)
            {
                return(RedirectToAction("Index", "Error", new { message = ex.Message, stackTrace = ex.StackTrace }));
            }


            return(RedirectToAction("Index"));
        }