/// <summary>
        ///  Update ItemPrice data to ItemPrice Table according to the ItemPrice Parameter
        ///   Return Constants.DB_STATUS 
        /// </summary>
        /// <param name="itemPrice"></param>
        /// <returns></returns>
        public Constants.DB_STATUS Update(ItemPrice itemPrice)
        {
            Constants.DB_STATUS status = Constants.DB_STATUS.UNKNOWN;

            try
            {
                itemPriceObj = inventory.ItemPrices.Where(iObj => iObj.ItemId == itemPrice.ItemId).First();
                if (!itemPriceObj.Equals(null))
                {
                    Employee createdBy = inventory.Employees.Where(eObj => eObj.Id == itemPrice.CreatedBy.Id).First();
                    itemPriceObj.SupplierId = itemPrice.SupplierId;
                    itemPriceObj.Price = itemPrice.Price;
                    itemPriceObj.CreatedDate = itemPrice.CreatedDate;
                    itemPriceObj.CreatedBy = createdBy;
                    inventory.SaveChanges();
                    status = Constants.DB_STATUS.SUCCESSFULL;
                }
            }
            catch (Exception e)
            {
                status = Constants.DB_STATUS.FAILED;
            }

            return status;
        }