static void GetTotalIncome(int startYear, int endYear, string companyName)
    {
        NORTHWNDEntities db = new NORTHWNDEntities();

        using (db)
        {
            var income = db.usp_FindTotalIncome111(startYear, endYear, companyName);
            Console.WriteLine("Total income is: {0}", income.FirstOrDefault());
        }
    }