public string SaveStockin(StockIn stockIn)
        {
            int bigQuantity    = stockIn.BigQuantity * 50;
            int mediumQuantity = stockIn.MediumQuantity * 30;
            int smallQuantity  = stockIn.SmallQuantity * 15;

            stockIn.TotalQuantity = bigQuantity + mediumQuantity + smallQuantity;

            if (_stockIn.SaveStockin(stockIn) > 0)
            {
                return("Item Entry Successfully");
            }

            return("Item Entry Faild");
        }